So legally there is no way out of that clause, they are just making you aware of this fact.
Once an unconditional offer is accepted they will stop marketing the property and will lose any other buyers that
Just confirm with the agent what you can and can't change - remember its a negotiation so its fine to make demands they must just be valid.
Don't muck around though its just going to p1ss people off and when there is big money involved there are big lawyers invovled.
I don't think this is the way it works. Some agents tend to promote the notion that the three parties are all immutably linked together, whereas they need not be, not at all.
Contract A (first, chronologically)
The seller has a contract with the agent (or several agents). Contract A is set up long before the buyer is even on the scene, and the buyer has nothing whatsoever to do with that contract, is not party to it and has no responsibility within it, cannot influence its conditions, nor should the buyer - as an outsider meeting the parties to Contract
A later on - ever be called upon to mitigate any consequences for the outworkings of that contract. The buyer does not owe any fee to the agent.
Contract B
The buyer makes the offer OTP to the seller. The seller decides whether or not to accept. If the seller accepts, then the OTP becomes the contract. Here, the agent is the non-party.
The so-called "standard" OTPs are
built by the agent's lawyers and not, in fact, standard, which explains why there are so many different versions of them. The agents will demand of their lawyers to formulate clauses to protect the agent's commission. This is because of the fear (not unfounded) that the seller and buyer may try to collude to save money by cutting out the agent. It is, however, not correct
of the seller to go behind the agent's back if the agent has genuinely put in the effort of marketing the property, and when the buyer really did meet the seller through the efforts of the agent. If the agent has delivered what was contracted in Contract
A, i.e. brought about a match of buyer and seller, then the seller owes the agent the commission as agreed upon in Contract
A. Even so: whatever the agent gets or does not get is not an issue for the buyer to deal with. The buyer has no legal connection whatsoever to the agent and, consequently, no duties with regard to how the seller fulfils or fails to fulfil Contract
A, towards the agent.
Muddied waters
At least: the buyer has no connection to the agent
until they are foolish enough to bind themselves, voluntarily, to the seller and the agent, in unholy matrimony, by agreeing to a clause in Contract
B that muddles the contractual roles. The agent's commission is governed by Contact
A, and the agent has no business trying to get the buyer to sign any clause in Contract
B to guarantee some or all of the agent's commission, and the buyer has no business stepping into the shoes of the seller in Contract
A.