Surprisingly greet bird (5)
I believe the answer is:
egret
'bird' is the definition.
(egret is a kind of bird)
'surprisingly greet' is the wordplay.
'surprisingly' is an anagram indicator (a surprising ordering of the letters).
'greet' anagrammed gives 'EGRET'.
(Other definitions for egret that I've seen before include "Greet (anag) -- wading bird" , "Kind of heron with long white feathers" , "Stork-like bird" , "Kind of white heron - greet it" , "flier" .)