Crossword Genius

Is rare rock from a range of mountains? (6)

Ross

I believe the answer is:

sierra

'a range of mountains?' is the definition.
(sierra is a kind of range of mountains)

'is rare rock' is the wordplay.
'rock' indicates an anagram.
'is'+'rare'='israre'
'israre' with letters rearranged gives 'SIERRA'.

'from' is the link.

(Other definitions for sierra that I've seen before include "that Romeo is not after" , "Model of car from Ford" , "Nato alphabet 'S'" , "International codeword" , "Long range" .)

I've seen this clue in the Irish Times.
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