Crossword Genius

Excellent fireplace, pushing energy forward (5)

Ross

I believe the answer is:

great

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'excellent' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

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(Other definitions for great that I've seen before include "Excellent (colloq.)" , "Big, large" , "Of major significance - very good" , "Brunel's third and last steamship" , "Peter the -, Russ. tsar" .)

I've seen this clue in The Independent.
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