Dress in mirror after seeing doctor (5)
I believe the answer is:
drape
'dress' is the definition.
(thesaurus)
'mirror after seeing doctor' is the wordplay.
'mirror' becomes 'ape' (I've seen this in other clues).
'after' says to put letters next to each other.
'seeing doctor' becomes 'dr' ('Dr' can be a synonym of 'doctor').
'ape' put after 'dr' is 'DRAPE'.
'in' acts as a link.
(Other definitions for drape that I've seen before include "Pared (anag.)" , "Cover loosely for padre" , "Cover loosely with cloth" , "Screen" , "Spread (cloth over)" .)