Play some instruments (5)
I believe the answer is:
strum
'play' is the definition.
(I know that strum is a more specific form of the action play)
'some instruments' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'STRUM' can be found hidden inside 'instruments'.
(Other definitions for strum that I've seen before include "Pluck the strings idly" , "Plays guitar" , "Casually play (on a stringed instrument)" , "Play badly on a guitar" , "Play a banjo" .)