Support true reforms after move quickly backfiring (7)
I believe the answer is:
nurture
'support' is the definition.
(I've seen this before)
'true reforms after move quickly backfiring' is the wordplay.
'reforms' indicates anagramming the letters.
'after' means one lot of letters go next to another.
'move quickly' becomes 'run' (I've seen this before).
'backfiring' is a reversal indicator.
'run' back-to-front is 'nur'.
'true' with letters rearranged gives 'ture'.
'ture' after 'nur' is 'NURTURE'.
(Other definitions for nurture that I've seen before include "Raise" , "Help develop and grow" , "Rue runt involved in process of rearing" , "Nourishment" , "Care for during upbringing" .)