Hot music lacking breadth (5)

I believe the answer is:

hairs

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'hot music lacking breadth' is the definition.
I can't tell whether this definition defines the answer.

'hot music' is the wordplay.
'hot' becomes 'h'.
'music' becomes 'airs'.
'h'+'airs'='HAIRS'

Can you help me to learn more?

(Other definitions for hairs that I've seen before include "eg Bristles" , "Threadlike growths" , "Skin growths" , "Fur filaments" , "See 3" .)

I've seen this clue in the Evening Standard.

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