Crossword Genius

Grass that may bend over with no effect (6)

Ross

I believe the answer is:

marram

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'grass' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

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(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 Telegraph.
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