Took over additional accommodation? (7)
I believe the answer is:
annexed
'took over' is the definition.
(annexing is a kind of taking over)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for annexed that I've seen before include "Did appropriate" , "Joined through conquest" , "Took possession of another country" , "Usurped" , "Took possession of, often territory" .)