Crooked impostor has me for change (13)
I believe the answer is:
metamorphosis
'change' is the definition.
(metamorphosis is a kind of change)
'crooked impostor has me' is the wordplay.
'crooked' is an anagram indicator.
'impostor'+'has'+'me'='impostorhasme'
'impostorhasme' is an anagram of 'METAMORPHOSIS'.
'for' is the link.
(Other definitions for metamorphosis that I've seen before include "Total change in form" , "Transmutation" , "Process of transformation" , "Total change in character" , "Complete change of appearance" .)