Crossword Genius

Producer of paper's got rap several upcoming mentions (7)

Ross

I believe the answer is:

esparto

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

'producer' is the definition.
Both the answer and definition are singular nouns.
Perhaps there's a link between them I don't understand?

'paper's got rap several upcoming mentions' is the wordplay.
'ESPARTO' is hidden back-to-front within the letters.
However, I am not sure how this is indicated.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for esparto that I've seen before include "Grass, used for ropes, paper" , "Coarse type of grass" , "Source of paper" , "Fibrous grass" , "Tap Eros for the grass" .)

I've seen this clue in The Telegraph.
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