Crossword Genius

Judges made case for royal mugs (7)

Ross

I believe the answer is:

beakers

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

'mugs' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Maybe you can see a link between them that I can't see?

'judges made case for royal' is the wordplay.
I cannot really understand how this works, but
'royal' could be 'er' (abbreviation for Elizabeth Regina) and 'er' is located in the answer.
The remaining letters 'beaks' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for beakers that I've seen before include "Flat-bottomed jars" , "Flat-bottomed cups" .)

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