Crossword Genius

Energy doubled self-confidence (3)

Ross

I believe the answer is:

ego

I'm a little stuck... Click here to teach me more about this clue!

'self-confidence' is the definition.
(I've seen this before)

'energy doubled' is the wordplay.
I cannot really understand how this works, but
'energy' could be 'go' (go can mean energy or enthusiasm) and 'go' is located in the answer.
A single letter 'e' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for ego that I've seen before include "Self-esteem, sense of self" , "Inner self" , "Sense of self, conceit" , "Conscious self" , "Selfishness" .)

I've seen this clue in The Times.
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