Chuck's retiring (3)

I believe the answer is:

shy

This clue is a double definition.

'chuck's' is the first definition.
(thesaurus)

'retiring' is the second definition.
(thesaurus)

(Other definitions for shy that I've seen before include "Coy" , "Demure" , "'Timid, diffident (3)'" , "Bashful or timid" , "Recoil" .)

I've seen this clue in the Evening Standard.

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