Intelligence of kinfolk? (4)
I believe the answer is:
info
'intelligence' is the definition.
(thesaurus)
'of kinfolk?' is the wordplay.
'of' says the answer is hidden in the clue.
'INFO' is hidden within 'kinfolk'.
(Other definitions for info that I've seen before include "Facts; knowledge gained" , "Intelligence (abbr)" , "Gen (abbr)" , "Latest" , "Knowledge (colloq.)" .)