Take over, making queen cross (5)
I believe the answer is:
annex
'take over' is the definition.
(I know that annex is a more specific form of the action take over)
'queen cross' is the wordplay.
'queen' becomes 'anne' (Queen Anne, 18th-century queen).
'cross' becomes 'x' (an X is a cross).
'anne'+'x'='ANNEX'
'making' is the link.
(Other definitions for annex that I've seen before include "Add as an extra part" , "Attach(ment)" , "Take (land) by conquest" , "Tack on" , "Join - add" .)