Religious work interrupted by English national (6)

I believe the answer is:

korean

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'national' is the definition.
(I know that Korean is the class of people from Korea)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for korean that I've seen before include "Citizen of divided country" , "Asian language" , "Asian national" , "From Pyongyang, perhaps" , "Eg, from Seoul" .)

I've seen this clue in The Sunday Times and The Times.

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