Bird for one: about time (5)
I believe the answer is:
egret
'bird' is the definition.
(egret is a kind of bird)
'for one about time' is the wordplay.
'for one' becomes 'eg' (I've seen this in other clues).
'about time' becomes 'ret' (I've seen this in other clues).
'eg'+'ret'='EGRET'
(Other definitions for egret that I've seen before include "white fish eater" , "Kind of heron with long white feathers" , "Bird eating fish" , "White wading bird" , "flier" .)