A little sun-beam (6)

I believe the answer is:

slight

'a little' is the definition.
(thesaurus)

'sun-beam' is the wordplay.
'sun' becomes 's'.
'beam' becomes 'light' ('light beam' can be a synonym of 'beam').
'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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