Contacted revolutionary, a revolutionary's admitted (7)
I believe the answer is:
reached
'contacted' is the definition.
('reach' can be a synonym of 'contact')
'revolutionary a revolutionary's admitted' is the wordplay.
'revolutionary' becomes 'red'.
'revolutionary' becomes 'che' (Che Guevara the Marxist revolutionary).
'admitted' means one lot of letters goes inside another.
'a'+'che'='ache'
'red' enclosing 'ache' is 'REACHED'.
(Other definitions for reached that I've seen before include "Came to (a place)" , "Cad here (anag.)" , "Stretched or arrived" , "Attained" .)