Compensation earned on gym accident (6,5)

I believe the answer is:

danger money

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'compensation' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see a link between them that I don't see?

'earned on gym accident' is the wordplay.
'earned on gym' can be anagrammed to 'DANGER MONEY'.
But, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for danger money that I've seen before include "Extra payment on account of risk" , "Bonus payment for perilous work" , "Extra pay for risk-taker" , "Compensation for those at risk" , "Payment for taking risks" .)

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

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