Policeman, one stopping pot user — an artist (5,9)

I believe the answer is:

chief constable

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'policeman' is the definition.
(I know that Chief Constable is a type of captain)

'stopping pot user an artist' is the wordplay.
'stopping' indicates putting letters inside (stopping can mean blocking a gap).
'pot user' becomes 'chef' (I've seen this in another clue).
'an' becomes 'i' (Roman numeral for one).
'artist' becomes 'constable' (painter John Constable).
'chef' enclosing 'i' is 'chief'.
'chief'+'constable'='CHIEF CONSTABLE'

'one' acts as a link.
I am not very happy about this link. It may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for chief constable that I've seen before include "Busy high up" , "Police officer" , "Bobby's superior" , "law enforcer" .)

I've seen this clue in The Times.

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