Crossword Genius

Musical about Genesis etc lifting agent?

Ross

I believe the answer is:

hot air

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

'etc lifting agent?' is the definition.
I can't judge whether this defines the answer.

'musical about genesis' is the wordplay.
'musical' becomes 'hair' (I've seen this before).
'about' indicates putting letters inside.
'genesis' becomes 'ot' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'hair' placed around 'ot' is 'HOT-AIR'.

Can you help me to learn more?

(Other definitions for hot air that I've seen before include "Bull" , "over the Sahara?" , "Loud and empty talk to lift a balloon?" , "Empty bombast often found in balloon" , "Boastful talk or balloon filler" .)

I've seen this clue in The Telegraph.
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