Grass that comes up just the same (6)

I believe the answer is:

marram

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

'grass' is the definition.
(marram is a type of grass)

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

(Other definitions for marram that I've seen before include "Grass of the seaside" , "Coarse grass on sandy beaches" , "Sea grass" .)

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.