Business assembly for surfers? (12)

I believe the answer is:

boardmeeting

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'business assembly for surfers?' is the definition.
I can't judge whether this defines the answer.

'business assembly' is the wordplay.
'business' becomes 'board' (I can't justify this - if you can you should give a lot more credence to this answer).
'assembly' becomes 'meeting' (meeting is a kind of assembly).
'board'+'meeting'='BOARDMEETING'

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I've seen this clue in The Daily Express.

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