Chuck's a bit pushy! (3)

I believe the answer is:

shy

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

I can't explain the remainder of the clue.

(Other definitions for shy that I've seen before include "guarded" , "Timid; throw quickly" , "Timid (around people)" , "Tongue-tied" , "'Lacking self-confidence, timid (3)'" .)

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