With companion, I again occupy the apartment (6)
I believe the answer is:
paired
'with companion i again occupy the apartment' is the definition.
I can't tell whether this definition defines the answer.
'again occupy the apartment' is the wordplay.
I cannot really see how this works, but
'again' could be 're' and 're' is located in the answer.
The remaining letters 'paid' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for paired that I've seen before include "Were mates" , "'Coupled, matched (6)'" .)