Pull the plug, but not quietly! (3)
I believe the answer is:
lug
'pull' is the definition.
(thesaurus)
'the plug but not quietly' is the wordplay.
'but not' is a deletion indicator.
'quietly' becomes 'p' (p for piano and quiet).
'plug' with 'p' taken out is 'LUG'.
(Other definitions for lug that I've seen before include "Drag, haul" , "Projecting piece; haul" , "Drag heavily" , "Carry with difficulty" , "Drag or carry with effort" .)