Zilch found in Kenilworth (3)
I believe the answer is:
nil
'zilch' is the definition.
(synonyms)
'in kenilworth' is the wordplay.
'in' says the answer is hidden in the clue.
'NIL' is hidden in the letters of 'kenilworth'.
'found' is the link.
(Other definitions for nil that I've seen before include "Nothing - in Latin" , "Don't despair - . . . desperandum" , "Love" , "Nothing, zero" , "Zero, zilch" .)