Bid or proposal (5)
I believe the answer is:
offer
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">bid</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">proposal</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(an offer is a proposal or suggestion)</span><br/ ><br/ ></span>
(Other definitions for offer that I've seen before include "Come up with" , "Provide; reduced price" , "Expression of willingness to pay or give" , "Chance to buy at reduced price?" , "Proposal (of marriage)" .)