Might that be Arctic roll, did you say? (4)
I believe the answer is:
tern
'might that be arctic' is the definition.
(as in an arctic tern)
'roll did you say?' is the wordplay.
'roll' becomes 'turn' (turn can mean to roll over).
'did you say?' indicates a 'sounds like' (homophone) clue.
'turn' sounds like 'TERN'.
(Other definitions for tern that I've seen before include "Gull-like sea bird" , "Winger" , "Gull-like seabird" , "Long-winged aquatic bird" , "Small seabird with forked tail" .)