Cereal in form of dependency (8)
I believe the answer is:
reliance
'dependency' is the definition.
(I know that reliance is a type of dependency)
'cereal in form' is the wordplay.
'form' is an anagram indicator (a different form of the same letters).
'cereal'+'in'='cerealin'
'cerealin' with letters rearranged gives 'RELIANCE'.
'of' acts as a link.
(Other definitions for reliance that I've seen before include "Faith" , "Trust or confidence" , "Trust - in cereal (anag)" , "Dependence (on something)" , "Dependence, trust" .)