What doctor will do for delicacy? (5)
I believe the answer is:
treat
I believe this clue is a double definition.
'what doctor will do' is the first definition.
'delicacy?' is the second definition.
('treat' can be a synonym of 'delicacy')
'for' is the link.
(Other definitions for treat that I've seen before include "Entertain and pick up the tab" , "Tetra (anag.)" , "Event causing special pleasure" , "Pay for - minister to - deal with" , "Buy a drink for, for instance" .)