Crossword Genius

Bone problem besetting winger (7)

Ross

I believe the answer is:

sternum

'bone' is the definition.
(sternum is a kind of bone)

'problem besetting winger' is the wordplay.
'problem' becomes 'sum' (arithmetic problem).
'besetting' means one lot of letters goes inside another.
'winger' becomes 'tern' (tern is a kind of bird**).
'sum' placed around 'tern' is 'STERNUM'.

(Other definitions for sternum that I've seen before include "front of breast" , "somewhere in chest" , "Breastbone" , "Chest bone" , "Human bone -- ten rums (anag)" .)

I've seen this clue in The Times.
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