He reigns ineptly, though fairly committed to environment (8)

I believe the answer is:

greenish

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'fairly committed to environment' is the definition.
I can't judge whether this defines the answer.

'he reigns ineptly' is the wordplay.
'ineptly' indicates anagramming the letters (I've seen this in other clues).
'he'+'reigns'='hereigns'
'hereigns' with letters rearranged gives 'GREENISH'.

'though' acts as a link.

Can you help me to learn more?

(Another definition for greenish that I've seen is " Rather inexperienced".)

I've seen this clue in The Times.

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