Crossword Genius

I can’t fit in a clue for “amount” (3,3,3)

Ross

I believe the answer is:

odd man out

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

'i can't fit in a clue' is the definition.
I can't tell whether this definition defines the answer.

'amount' is the wordplay.
I cannot really understand how this works, but
an anagram of 'amount' is 'manout' which is present in the answer.
The remaining letters 'odd' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'for' acts as a link.

Can you help me to learn more?

(Other definitions for odd man out that I've seen before include "Nonconformist" , "Something not fitting in" , "Atypical or unconventional person" , "film starring James Mason" , "Misfit, does not blend into group" .)

I've seen this clue in The Sunday Times.
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