Above taking part in wildcat operations (4)
I believe the answer is:
atop
'above' is the definition.
(thesaurus)
'part in wildcat operations' is the wordplay.
'part in' indicates a hidden word.
'ATOP' can be found hidden inside 'wildcat operations'.
'taking' is the link.
(Other definitions for atop that I've seen before include "Situated on" , "On (poetic)" , "on the head" , "On the peak" , "in dominant position" .)