Crossword Genius

Both on a roll in a spanking (but not a new) light aircraft? (3-3,7)


I believe the answer is:

hot-air balloon

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

'aircraft?' is the definition.
(hot-air balloon is a kind of aircraft)

'both on a roll in a spanking but not a new light' is the wordplay.
I cannot quite understand how this works, but
'on' is present in the answer.
'a' is within the answer.
'roll' could be 'ball' (balling is a kind of rolling) and 'ball' is located in the answer.
'not' could be 'o' (I've seen this in other clues) and 'o' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for hot-air balloon that I've seen before include "Flame-powered craft" , "Craft using heat to gain altitude" , "Basket lifter" , "Aerial transport" , "Lighter-than-air craft" .)

I've seen this clue in The Telegraph.
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