Bid isn't noticed at the back (2-5)

I believe the answer is:

no-trump

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'bid' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for no-trump that I've seen before include "Type of bid at bridge" , "Highest bid in bridge" , "Having no suit ranking above all others" , "Bid in contract bridge" , "Bid type that's top" .)

I've seen this clue in The Irish Times.

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