To try reforming cheat brings anguish (9)
I believe the answer is:
heartache
'anguish' is the definition.
(I've seen this before)
'to try reforming cheat' is the wordplay.
'to try' becomes 'hear' (as in to try someone in court or hear their case).
'reforming' indicates anagramming the letters.
'cheat' anagrammed gives 'tache'.
'hear'+'tache'='HEARTACHE'
'brings' is the link.
(Other definitions for heartache that I've seen before include "Emotional distress" , "Agony of Love" , "it gives rise to anguish" , "mental anguish!" , "Grief" .)