Are Wanderers after quiet sort of tournament? (3-2)

I believe the answer is:

pro-am

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'quiet sort of tournament?' is the definition.
The definition suggests an adjective which matches the answer.

'are wanderers' is the wordplay.
I cannot really understand how this works, but
'are' could be 'a' (short for 'are', historical unit of measurement) and 'a' is found in the answer.
The remaining letters 'prom' 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).

'after' is the link.

Can you help me to learn more?

I've seen this clue in The Times.

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