Chuck is worth reforming (5)
I believe the answer is:
throw
'chuck' is the definition.
(I've seen this before)
'worth reforming' is the wordplay.
'reforming' is an anagram indicator.
'worth' is an anagram of 'THROW'.
'is' is the link.
(Other definitions for throw that I've seen before include "Organise party" , "Hurl; perplex" , "lose on purpose" , "Try to lose" , "Cast, fling" .)