Bids for chests without a number (6)

I believe the answer is:

offers

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'bids' is the definition.
('offer' can be a synonym of 'bid')

I cannot understand how the remainder of the clue works.

(Other definitions for offers that I've seen before include "volunteers" , "Presents for acceptance or refusal" , "Makes bid or tenders" , "Presents for acceptance or rejection" , "Specially reduced prices" .)

I've seen this clue in The Telegraph.

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