Men sitting with a conservative in chapel (7)
I believe the answer is:
oratory
'chapel' is the definition.
(an oratory is a small chapel)
'men sitting with a conservative' is the wordplay.
'men sitting' becomes 'ora' (I can't justify this - if you can you should give a lot more credence to this answer).
'with' is a charade indicator (letters next to each other).
'a conservative' becomes 'tory' (informal term for a Conservative Party member).
'ora'+'tory'='ORATORY'
'in' is the link.
Can you help me to learn more?
(Other definitions for oratory that I've seen before include "church" , "Formal speech-making, could be pompous" , "Rhetoric - chapel" , "formal speech" , "prayer room" .)