Local bar provides liquid lunch for all the members from both houses (5,7)

I believe the answer is:

joint session

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'liquid lunch for all the members from both houses' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'local bar provides' is the wordplay.
I cannot really understand how this works, but
'provides' could be 'joints' (jointing is a kind of providing) and 'joints' is found within the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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