Poke quietly with stick (4)
I believe the answer is:
Here is my best explanation:
'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).
(Other definitions for prod that I've seen before include "Poke with stiff finger to urge", "Poke; reminder", "Poke or spur", "Poke - remind", "Jab - nudge", "Nudge", "Poke with a stick", "Poke, stimulate into action", "Motivate; jab" and "Push with pointed instrument".)