Crew member pocketing a charm (4)
I believe the answer is:
coax
'charm' is the definition.
(thesaurus)
'crew member pocketing a' is the wordplay.
'crew member' becomes 'cox' (I've seen this in another clue).
'pocketing' indicates putting letters inside.
'cox' placed around 'a' is 'COAX'.
(Other definitions for coax that I've seen before include "Flatter" , "Inveigle" , "Gently persuade" , "Wheedle, cajole" , "Gradually persuade (someone)" .)