Convert (9)
'convert' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for transform that I've seen before include "Change markedly" , "adapt" , "Subject to change" , "Make great change in appearance of" , "Change completely" .)
'convert' is the definition.
(reforming is a kind of converting)
This is the entire clue.
(Other definitions for reform that I've seen before include "Correct(ion of) abuses" , "Go straight" , "Abandon evil practices" , "Removal of abuses" , "Mend one's ways" .)