I will interrupt Silas, a man of the sea (7)

I believe the answer is:

mariner

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'man of the sea' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for mariner that I've seen before include "collier?" , "Man of the sea" , "Sea dog" , "Sea-goer, ancient in the poem" , "Seafarer, old salt" .)

I've seen this clue in The Irish Independent.

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