Unpleasant row about retired medic (7)
I believe the answer is:
noisome
'unpleasant' is the definition.
(I've seen this before)
'row about retired medic' is the wordplay.
'row' becomes 'noise' (row can mean a disturbance or noise).
'about' indicates putting letters inside.
'retired' shows that the letters should be reversed in order.
'medic' becomes 'mo' (medical officer).
'mo' reversed gives 'om'.
'noise' enclosing 'om' is 'NOISOME'.
(Other definitions for noisome that I've seen before include "Moonies (anag.)" , "Disgusting to sight or smell" , "Offensively malodorous" , "Offensively smelling" , "Smelling badly" .)