Crossword Genius

At which lawyers drink? (3)

Ross

I believe the answer is:

bar

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

This might be a double definition.

'at' is the first definition.
The definition and answer can be both quantities as well as being singular nouns.
Maybe you can see a link between them that I can't see?

'lawyers drink?' is the second definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'which' is the link.

Can you help me to learn more?

(Other definitions for bar that I've seen before include "Iron rod or drinks counter" , "Ballet dancer's exercise rail" , "Exclude; sandbank" , "Save; pub" , "A pub counter or iron rod" .)

I've seen this clue in the Sydney Morning Herald.
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