Hog the mirror (5)
I believe the answer is:
preen
'hog the mirror' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for preen that I've seen before include "Primp" , "Titivate oneself" , "to give himself a pat on the back" , "Tidy and clean (plumage)" , "Clean with the beak" .)