Crossword Genius

Plenty may be cast (4)

Ross

I believe the answer is:

lots

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

'plenty' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for lots that I've seen before include "Large number or amount" , "a crowd?" , "Many found in slot" , "Oodles" , "Tons" .)

I've seen this clue in the Evening Standard.
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