Jab quietly with stick (4)
I believe the answer is:
prod
'jab' is the definition.
(I know that jab can be written as prod)
'quietly with stick' is the wordplay.
'quietly' becomes 'p' (musical symbol).
'with' means one lot of letters go next to another.
'stick' becomes 'rod' (I've seen this before).
'p'+'rod'='PROD'
(Other definitions for prod that I've seen before include "Remind (with elbow or stick?)" , "Spur or goad" , "Poke with forefinger, stimulate" , "Induce action (with stick etc?)" , "Provide stimulation" .)