Crossword Genius

A GI described many (1,8,3,3)

Ross

I believe the answer is:

a thousand and one

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

'a gi described many' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'a gi described many' is the wordplay.
I cannot really see how this works, but
'a' could be 'one' and 'one' is found within the answer.
'many' could be 'd' (Roman numeral for 500) and 'd' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Daily Express.
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