Crossword Genius

A lamp is burning (6)

Ross

I believe the answer is:

alight

'is burning' is the definition.
(set alight)

'a lamp' is the wordplay.
'lamp' becomes 'light' (I've seen this before).
'a'+'light'='ALIGHT'

(Other definitions for alight that I've seen before include "Burning; get down" , "scorched?" , "Come down - on fire" , "Disembark, land" , "Disembark; on fire" .)

I've seen this clue in The Mirror.
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