Amount returned somewhat large for players (5)

I believe the answer is:

musos

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'players' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'amount returned somewhat large' is the wordplay.
'amount' becomes 'sum' (synonyms).
'returned' is a reversal indicator.
'somewhat large' becomes 'os' (abbreviation for oversize. I am not sure about the 'somewhat' bit.).
'sum' back-to-front is 'mus'.
'mus'+'os'='MUSOS'

'for' is the link.

Can you help me to learn more?

(Another definition for musos that I've seen is " Pop enthusiasts".)

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

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