Crossword Genius

Airhead blonde's on fire (6)

Ross

I believe the answer is:

alight

'on fire' is the definition.
('alight' can be a synonym of 'on fire')

'airhead blonde's' is the wordplay.
'airhead' becomes 'a' (head letter of 'air').
'blonde' becomes 'light' (I've seen this before).
'a'+'light'='ALIGHT'

(Other definitions for alight that I've seen before include "Get off the bus because it's on fire" , "Descend from vehicle" , "Disembark; on fire" , "Burning; descend" , "'Step off, a bus, say (6)'" .)

I've seen this clue in The Telegraph.
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