Settler in Croatia upset about Jack residing in Dudley (11)

I believe the answer is:

adjudicator

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'settler' is the definition.
(I have seen 'Settler of disagreement ' mean 'adjudicator' so perhaps 'settler' could also mean 'adjudicator')

'croatia upset about jack residing in dudley' is the wordplay.
I cannot quite see how this works, but
'about' could be 'ca' (circa) and 'ca' is found in the answer.
'jack' could be 'j' (playing card abbreviation) and 'j' is present in the answer.
This explanation may well be incorrect...

'in' acts as a link.

Can you help me to learn more?

(Other definitions for adjudicator that I've seen before include "Settler of disagreement" , "Arbitrator" .)

I've seen this clue in The Times.

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