Parakeets do it (5)
I believe the answer is:
preen
'parakeets do it' 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 "demonstrate pride" , "(Of a bird) tidy and clean feathers" , "Titivate oneself" , "Dress or smooth, feathers say" , "Groom (oneself) with evident vanity" .)