Dear Charles has that roguish quality (4)

I believe the answer is:

arch

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'roguish quality' is the definition.
Both the answer and definition are adjectives. Maybe there's an association between them I don't understand?

'dear charles has' is the wordplay.
'has' indicates a hidden word.
'ARCH' can be found hidden inside 'dear charles'.

'that' acts as a link.

Can you help me to learn more?

(Other definitions for arch that I've seen before include "Affectedly playful like curved structure" , "Roguish, teasing" , "Playfully superior" , "Main" , "Knowing, coy" .)

I've seen this clue in the Evening Standard.

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