Leeds can change if purified (8)
I believe the answer is:
cleansed
'purified' is the definition.
(I've seen this before)
'leeds can change' is the wordplay.
'change' indicates anagramming the letters.
'leeds'+'can'='leedscan'
'leedscan' with letters rearranged gives 'CLEANSED'.
'if' is the link.
(Other definitions for cleansed that I've seen before include "Leeds can (anag.)" , "Purified" , "Absolved" , "missing the filthy bits?" .)