Sunny little chap? (3)

I believe the answer is:

sol

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'chap' is the definition.

'sunny little' is the wordplay.
'sunny' becomes 'so' (I am not sure about this - if you are sure you should believe this answer much more).
'little' becomes 'L' (abbreviation for little).
'so'+'l'='SOL'

Can you help me to learn more?

(Other definitions for sol that I've seen before include "Note; Peruvian currency" , "Fifth note of scale" , "The sun in Spain" , "A Latin sun" , "The sun in 12 Across" .)

I've seen this clue in the Evening Standard.

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