Agreement about amateur or professional stage performer (4-5)

I believe the answer is:

play-actor

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'agreement about amateur' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'professional stage performer' is the wordplay.
'professional stage' becomes 'play' (I am not sure about this - if you are sure you should believe this answer much more).
'performer' becomes 'actor' (actor is a kind of performer).
'play'+'actor'='PLAY-ACTOR'

'or' is the link.

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I've seen this clue in The Globe and Mail.

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