Cut? Listen to expert in the surgery (4)
I believe the answer is:
dock
'cut?' is the definition.
(docking is a kind of cutting)
'listen to expert in the surgery' is the wordplay.
'listen to' indicates a 'sounds like' (homophone) clue.
'expert in the surgery' becomes 'doc' (doctor).
'doc' sounds like 'DOCK'.
(Other definitions for dock that I've seen before include "Port area - defendant's area - deduct - weed" , "Boat mooringd" , "Clip" , "Antidote to nettle stings" , "Where ships tie up" .)