Arctic bird heading for Spitsbergen currently pursued by fool (4,5)
I believe the answer is:
snow goose
'arctic bird' is the definition.
(I've seen this in another clue)
'heading for spitsbergen currently pursued by fool' is the wordplay.
'heading for' indicates taking the first letters.
'currently' becomes 'now' (right now).
'pursued by' is a charade indicator (letters next to each other).
'fool' becomes 'goose' (goose is a kind of fool).
The first letter of 'spitsbergen' is 's'.
's'+'now'+'goose'='SNOW-GOOSE'
(Other definitions for snow goose that I've seen before include "birdie" , "Arctic denizen" , "Gregarious Arctic bird" .)