Crossword Genius

Alternate energy, extremely different (5,5)

Ross

I believe the answer is:

every other

'alternate' is the definition.
('every other' can be a synonym of 'alternate')

'energy extremely different' is the wordplay.
'energy' becomes 'e' (physics symbol as in E=mc2).
'extremely' becomes 'very' (I've seen this before).
'different' becomes 'other' ('other' can be similar in meaning to 'different').
'e'+'very'+'other'='EVERY OTHER'

(Another definition for every other that I've seen is " the odd ones?".)

I've seen this clue in The Times.
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