Not free house, as they're bound to listen (7,8)

'they're bound to listen' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'not free house' is the wordplay.
I cannot really understand how this works, but
'house' could be 'audience' (I've seen this before) and 'audience' is found in the answer.
The remaining letters 'captive' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'as' is the link.

Can you help me to learn more?