Fabric in green, pure and simple (8)
I believe the answer is:
cashmere
'fabric' is the definition.
(cashmere is a kind of fabric)
'green pure and simple' is the wordplay.
'green' becomes 'cash' (slang term for money).
'pure and simple' becomes 'mere' (I've seen this before).
'cash'+'mere'='CASHMERE'
'in' acts as a link.
(Other definitions for cashmere that I've seen before include "Fine wool for a schemer" , "Expensive wool? Search me" , "Soft fabric made from the wool of a goat" , "Soft woollen fabric" , "'Fine, soft wool from a goat (8)'" .)