Devil has various treats to reveal (11)
I believe the answer is:
demonstrate
'reveal' is the definition.
(thesaurus)
'devil has various treats' is the wordplay.
'devil' becomes 'demon' ('demon' can be a synonym of 'devil'**).
'has' is a charade indicator (letters next to each other).
'various' indicates an anagram.
'treats' anagrammed gives 'strate'.
'demon'+'strate'='DEMONSTRATE'
'to' is the link.
(Other definitions for demonstrate that I've seen before include "Take part in public protest" , "Review" , "English floozies returning, led by villainous character" , "Prove, show" , "Show or display" .)