Pleasure boat avoiding area that may be packed (5)

I believe the answer is:

lunch

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'pleasure boat avoiding area that may be packed' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

This is the entire clue.

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(Another definition for lunch that I've seen is " Midday meal".)

I've seen this clue in The Times.

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