Friendly, wife with member (4)
I believe the answer is:
warm
'friendly' is the definition.
('warm' is associated in meaning with 'friendly')
'wife with member' is the wordplay.
'wife' becomes 'w'.
'with' means one lot of letters go next to another.
'member' becomes 'arm' (arm is a kind of member**).
'w'+'arm'='WARM'
(Other definitions for warm that I've seen before include "Apply heat to" , "Intimate - with a comfortable temperature" , "Affectionate; heat" , "Passionate; ardent" , "Affectionate - balmy" .)