Take over - giving a girl a kiss (5)
I believe the answer is:
annex
'take over' is the definition.
(I know that annex is a more specific form of take over)
'giving a girl a kiss' is the wordplay.
'giving' is a charade indicator (letters next to each other).
'a girl' becomes 'anne' (girl's name).
'a kiss' becomes 'x' (X can represent a kiss).
'anne'+'x' is 'ANNEX'.
(Other definitions for annex that I've seen before include "Join - add" , "Tack on" , "Attach, invade" , "Attach (land)" , "Add to one's territory" .)