Strip of green clothing transformed the design afresh (7)
I believe the answer is:
rethink
'design afresh' is the definition.
The answer and definition can be both related to thinking as well as being singular nouns.
Maybe there's an association between them I don't understand?
'strip of green clothing transformed the' is the wordplay.
'strip of green' becomes 'rink' (as in a bowling rink, part of a bowling green).
'clothing' is an insertion indicator (some letters cover up or clothe others).
'transformed' indicates anagramming the letters.
'the' with letters rearranged gives 'eth'.
'rink' enclosing 'eth' is 'RETHINK'.
Can you help me to learn more?
(Other definitions for rethink that I've seen before include "another assessment" , "Another consideration" , "Fresh ideas" , "Consider afresh" , "Take another approach" .)