Crossword Genius

The lemonade lady (4)

Ross

I believe the answer is:

mona

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

'lady' is the definition.

'the lemonade' is the wordplay.
'MONA' is hidden in amongst the letters.
But, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for mona that I've seen before include "Female" , "Lisa in the Louvre" .)

I've seen this clue in the Evening Standard.
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