Fuss in front of the mirror (5)
I believe the answer is:
preen
'fuss in front of the mirror' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for preen that I've seen before include "Congratulate (oneself); attend to dress" , "Beautify" , "Arrange feathers" , "Groom elaborately" , "Perfect one's appearance" .)