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Seamen like part of a church, we're told? (4)

Ross

I believe the answer is:

navy

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'seamen' is the definition.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for navy that I've seen before include "Armed force" , "Senior service" , "Marine force" , "Ships-of-war" , "Blue - ships and seamen" .)

I've seen this clue in The Everyman puzzle in The Observer.
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