Clean up for the doctor, quietly (3)
I believe the answer is:
mop
'clean up' is the definition.
(I've seen this in another clue)
'doctor quietly' is the wordplay.
'doctor' becomes 'mo' (medical officer).
'quietly' becomes 'p' (p for piano and quiet).
'mo'+'p'='MOP'
'for the' acts as a link.
(Other definitions for mop that I've seen before include "Implement for washing floor" , "Wet cleaner" , "Swab" , "It's used to wipe the floor" , "Clean; mass of hair" .)