Instrument I got stuck into in the herb garden (6)

I believe the answer is:

origan

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'garden' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?

I can't explain the remainder of the clue.

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(Another definition for origan that I've seen is " aromatic seasoning".)

I've seen this clue in the Evening Standard.

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