Arctic flyer (4)
I believe the answer is:
tern
'arctic flyer' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tern that I've seen before include "Gull-like sea bird" , "Rent out the bird" , "Small seabird with forked tail" , "Seabird related to the gull" , "Small slender gull" .)