A little sun-beam (6)

I believe the answer is:

slight

'a little' is the definition.
(I know that little can be written as slight)

'sun-beam' is the wordplay.
'sun' becomes 'S' (abbreviation).
'beam' becomes 'light beam' (synonyms).
's'+'light'='SLIGHT'

(Other definitions for slight that I've seen before include "Barely perceptible" , "Insubstantial; discourtesy" , "Small, snub" , "Small in degree; insult" , "Minor -- snub" .)

I've seen this clue in the Evening Standard.

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