Plants roses a messenger's delivered (7)

I believe the answer is:

sesames

I'm a little stuck... Click here to teach me more about this clue!

'plants' is the definition.
(sesame is a kind of plant)

'roses a messenger's delivered' is the wordplay.
'SESAMES' is hidden in amongst the letters.
But, I am not sure how the hidden word is indicated.

Can you help me to learn more?

(Another definition for sesames that I've seen is " Many a plant with seeds".)

I've seen this clue in The Independent.

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