Crossword Genius

Fuel (6)

Ross

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3 4

6

7 8

'fuel' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for energy that I've seen before include "Exertion of force" , "Gusto" , "Power - drive" , "'Vigour, vitality (6)'" , "Vigour, spirit" .)

I've seen this clue in The Times, the Evening Standard, The Mirror and The Telegraph.
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