Crossword Genius

Energy a lie-abed stay-at-home lacks? (3-2-3-2)

Ross

I believe the answer is:

get-up-and-go

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

'energy' is the definition.
(I know that energy can be written as get-up-and-go)

'a lie-abed stay-at-home lacks?' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for get-up-and-go that I've seen before include "'pizazz'" , "Vim" .)

I've seen this clue in the Evening Standard.
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