Largest amount returned by short multimillionaire (5)

I believe the answer is:

limit

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

'largest amount' is the definition.
'limit' can be an answer for 'amount' (limit is a kind of amount). I'm not certain of the 'largest' bit.

'returned by short multimillionaire' is the wordplay.
'LIMIT' is hidden backwards within the letters.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for limit that I've seen before include "end" , "Outer extent" , "border" , "Constrain" , "Curtail" .)

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

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