Resolute little chap (3)

I believe the answer is:

sol

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'chap' is the definition.

'resolute little' is the wordplay.
'SOL' is hidden within the letters.
However, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for sol that I've seen before include "Roman counterpart of Helios" , "Musical note" , "Note, old french coin" , "Spanish and poetic sun" , "Fifth note of scale" .)

I've seen this clue in the Evening Standard.

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