Disbelief is represented crudely in it (11)
I believe the answer is:
incredulity
'disbelief' is the definition.
(synonyms)
'represented crudely in it' is the wordplay.
'represented' indicates anagramming the letters.
'crudely'+'in'+'it'='crudelyinit'
'crudelyinit' with letters rearranged gives 'INCREDULITY'.
'is' acts as a link.
(Other definitions for incredulity that I've seen before include "Disbelief" , "Scepticism" .)