"Razor-billed" bird (3)
I believe the answer is:
auk
'razor-billed bird' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for auk that I've seen before include "One that flies" , "Stocky diving bird" , "Northern seabird with small narrow wings" , "Short-winged seabird" , "Northern sea bird with short narrow wings" .)