Those Charles has? (6)

I believe the answer is:

crowns

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'those' is the definition.
I can't tell whether this defines the answer.

'charles has?' is the wordplay.
'charles' becomes 'cr' (I can't justify this - if you can you should believe this answer much more).
'has?' becomes 'owns' ('own' can be a synonym of 'have').
'cr'+'owns'='CROWNS'

Can you help me to learn more?

(Other definitions for crowns that I've seen before include "emblems of kingship" , "caps" , "Symbols of monarchy" , "At least ten shillings" , "Tops of heads - tops of teeth" .)

I've seen this clue in The Guardian.

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