Here are the ins and outs of a large office (8)
I believe the answer is:
mailroom
'here are the ins and outs' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'of a large office' is the wordplay.
I cannot really understand how this works, but
'of' could be 'o' and 'o' is found within the answer.
'a' is within the answer.
'large' could be 'l' and 'l' is found in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for mailroom that I've seen before include "Place for sorting post" , "Post distribution point" .)