Crossword Genius

Sierra Club cofounder (4)

Ross

I believe the answer is:

muir

'sierra club cofounder' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for muir that I've seen before include "Frank -, British comedy writer; Scots for heath" , "Scottish upland heath" .)

I've seen this clue in the Newsday.
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