Divorcee, one in bed to take advantage of (7)
I believe the answer is:
exploit
'take advantage of' is the definition.
('exploit' can be a synonym of 'take advantage of')
'divorcee one in bed' is the wordplay.
'divorcee' becomes 'ex' (I've seen this in other clues).
'one' becomes 'i' (Roman numeral).
'in' indicates putting letters inside.
'bed' becomes 'plot' (I've seen this before**).
'i' put within 'plot' is 'ploit'.
'ex'+'ploit'='EXPLOIT'
'to' is the link.
(Other definitions for exploit that I've seen before include "Capitalise on, take advantage of" , "(Mis)use" , "Benefit from" , "Milk" , "The deed to make gain from" .)