Poke quietly with stick (4)
I believe the answer is:
prod
'poke' is the definition.
('prod' can be a synonym of 'poke')
'quietly with stick' is the wordplay.
'quietly' becomes 'p' (p for piano and quiet).
'with' is a charade indicator (letters next to each other).
'stick' becomes 'rod' (I've seen this before).
'p'+'rod'='PROD'
(Other definitions for prod that I've seen before include "Urge or stimulate" , "Poke with a stick" , "Drop (anag.)" , "Give a reminder" , "Spur or goad" .)