Gull clipping wings flew back concerned with wing bone? (5)

I believe the answer is:

ulnar

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

I cannot understand how the remainder of the clue works.

(Other definitions for ulnar that I've seen before include "Relating to a particular arm bone" , "Relating to one of the bones of the forearm" , "of certain bones" , "Relating to a bone in the forearm" .)

I've seen this clue in The Times and The Sunday Times.

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