Many nuts in our menus (8)

I believe the answer is:

numerous

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

'many' is the definition.
(similar in meaning)

'nuts in our menus' is the wordplay.
'our menus' anagrams to 'NUMEROUS'.
However, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for numerous that I've seen before include "Amounting to a large indefinite number" , "Large and indefinite in quantity" , "There's no shortage" , "Consisting of a large but indefinite number" , "Great in quantity" .)

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