New Zealander seen in khaki windcheater (4)
I believe the answer is:
kiwi
'new zealander' is the definition.
(informal term for someone from New Zealand)
'in khaki windcheater' is the wordplay.
'in' indicates a hidden word.
'KIWI' is hidden in the letters of 'khaki windcheater'.
'seen' acts as a link.
(Other definitions for kiwi that I've seen before include "apteryx" , "Hairy fruit with green flesh" , "Chinese gooseberry" , "New Zealander's bird" , "'Fruit, bird and NZ rugby player (4)'" .)