Fetching a soft sort of green heather (9)
I believe the answer is:
appealing
'fetching' is the definition.
(synonyms)
'a soft sort of green heather' is the wordplay.
'soft' becomes 'p' (musical abbreviation for 'piano').
'sort of green' becomes 'pea'.
'heather' becomes 'ling' (synonyms).
'a'+'p'+'pea'+'ling'='APPEALING'
(Other definitions for appealing that I've seen before include "Challenging a judgment" , "Likeable or imploring" , "Taking a case to a higher court" , "winning" , "Attractive, interesting" .)