Crossword Genius

Break promise about green energy (6)

Ross

I believe the answer is:

renege

'break promise' is the definition.
(as in reneging on a deal)

'about green energy' is the wordplay.
'about' is an anagram indicator.
'energy' becomes 'e' (physics symbol as in E=mc2).
'green' is an anagram of 'reneg'.
'reneg'+'e'='RENEGE'

(Other definitions for renege that I've seen before include "Fail to carry out a commitment" , "Fail to fulfil a promise or obligation" , "Go back on one's word, break promise" , "Fail to follow suit at cards" , "Fail to follow suit or fulfil a promise" .)

I've seen this clue in The Guardian.
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