Friend also included commission (7)
I believe the answer is:
mandate
'commission' is the definition.
(I've seen this before)
'friend also included' is the wordplay.
'friend' becomes 'mate' (mate is a kind of friend).
'also' becomes 'and' (both can mean in addition).
'included' is an insertion indicator.
'mate' placed around 'and' is 'MANDATE'.
(Other definitions for mandate that I've seen before include "Social appointment for male - or authority given" , "Give authority to" , "Decree" , "Legal authorisation" , "Authority to do something" .)