Doctor loves what you do (5)
I believe the answer is:
solve
'what you do' is the definition.
(I've seen this before)
'doctor loves' is the wordplay.
'doctor' indicates anagramming the letters.
'loves' with letters rearranged gives 'SOLVE'.
(Other definitions for solve that I've seen before include "Find the key - work out" , "Get answer to (a clue)" , "Voles (anag.)" , "Work out (a clue)" , "Person living voluntarily outside their own country" .)