Fusses at a mirror (6)
I believe the answer is:
preens
'fusses at a mirror' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for preens that I've seen before include "Grooms oneself in a vain manner" , "Trims feathers with beak" , "Grooms, as a bird would" , "Titivates" , "Arranges as a bird does its feathers" .)