Perfect son lit up when dancing (8)

I believe the answer is:

unspoilt

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'perfect' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

'son lit up when dancing' is the wordplay.
'when dancing' is an anagram indicator (letters dance around).
'son'+'lit'+'up'='sonlitup'
'sonlitup' with letters rearranged gives 'UNSPOILT'.

Can you help me to learn more?

(Other definitions for unspoilt that I've seen before include "Natural - perfect" , "Natural, unsullied" , "Virgin" , "Natural, not ruined" , "Retaining its original character" .)

I've seen this clue in The Times.

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