Crossword Genius

Leave en masse from the tearoom? (4,3)

Ross

I believe the answer is:

pour out

I'm a little stuck... Click here to teach me more about this clue!

'leave' is the definition.
The answer and definition can be both to do with motion as well as being verbs in their base form.
Maybe they are linked in a way I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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