Kind of unusual green (5)
I believe the answer is:
genre
'kind' is the definition.
(genre is a kind of kind)
'unusual green' is the wordplay.
'unusual' indicates an anagram.
'green' is an anagram of 'GENRE'.
'of' acts as a link.
(Other definitions for genre that I've seen before include "Literary type, species" , "Particular style of art or literature, may be green" , "Writing style" , "Brand" , "Category (of art)" .)