Trusting in later transformation (7)
I believe the answer is:
reliant
'trusting' is the definition.
(synonyms)
'in later transformation' is the wordplay.
'transformation' indicates an anagram.
'in'+'later'='inlater'
'inlater' with letters rearranged gives 'RELIANT'.
(Other definitions for reliant that I've seen before include "car firm" , "Robin was one < in need of support" , "Dependent - latrine (anag)" , "Dependent (on person)" , "Depending on another for support" .)