Paid and unpaid, maybe a romp (3-2)

I believe the answer is:

pro-am

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'paid and unpaid' is the definition.
I can't tell whether this defines the answer.

'maybe a romp' is the wordplay.
'maybe' indicates an anagram.
'a'+'romp'='aromp'
'aromp' anagrammed gives 'PRO-AM'.

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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