Rocky ravine is greener (6)

I believe the answer is:

naiver

'greener' is the definition.
('naive' can be similar in meaning to 'green')

'rocky ravine' is the wordplay.
'rocky' indicates anagramming the letters.
'ravine' anagrammed gives 'NAIVER'.

'is' acts as a link.

(Another definition for naiver that I've seen is " relatively artless".)

I've seen this clue in The Times.

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