One often on the job in bed? (14)

I believe the answer is:

horticulturist

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'job in bed?' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I don't understand how the remainder of the clue works.

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(Another definition for horticulturist that I've seen is " Garden expert".)

I've seen this clue in The Times.

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