Fibre for rope mats is a leaf extract (5)

I believe the answer is:

sisal

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

'fibre for rope' is the definition.
(I've seen this before)

'mats is a leaf extract' is the wordplay.
'SISAL' is hidden within the letters.
But, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for sisal that I've seen before include "Ropemaker" , "Strong rope fibre" , "Agave fibre found in bad sails" , "Fibre of Mexican agave" , "Rope fibre from leaves of tropical plant" .)

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.