Crossword Genius

Broken down bus means travelling light (8)

Ross

I believe the answer is:

'travelling light' is the definition.
(beams of light travelling from a source)

'broken down bus means' is the wordplay.
'broken down' is an anagram indicator.
'bus'+'means'='busmeans'
'busmeans' anagrammed gives 'SUNBEAMS'.

(Other definitions for sunbeams that I've seen before include "daylight?", "They provide light".)

I've seen this clue in The Guardian.