Dupe kind companion (7)
I believe the answer is:
consort
'companion' is the definition.
(thesaurus)
'dupe kind' is the wordplay.
'dupe' becomes 'con' (I've seen this before).
'kind' becomes 'sort' ('sort' can be a synonym of 'kind').
'con'+'sort'='CONSORT'
(Other definitions for consort that I've seen before include "Hang out with" , "Spouse, partner" , "Small group; spouse" , "helpmate" , "Habitually associate (with)" .)