Where we wait to check out perhaps, having checked in? (9,6)
I believe the answer is:
departure lounge
'having checked in?' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'where we wait to check out' is the wordplay.
I cannot quite see how this works, but
'check out' could be 'depart' (I've seen this in another clue) and 'depart' is found in the answer.
This explanation may well be incorrect...
'perhaps' acts as a link.
Can you help me to learn more?
(Another definition for departure lounge that I've seen is " whence one heads heavenwards?".)