Priest, perhaps one in the armed forces (10)

I believe the answer is:

serviceman

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'one in the armed forces' is the definition.
(someone in the armed services)

I can't explain the rest of the clue.

(Other definitions for serviceman that I've seen before include "car maintained by him?" , "Member of the armed forces" , "Private" , "Tommy" .)

I've seen this clue in The Telegraph.

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