Crossword Genius

Credulous servicemen? (7)

Ross

I believe the answer is:

marines

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'servicemen?' is the definition.
(marine is a kind of serviceman)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for marines that I've seen before include "Troops trained to serve on land or sea" , "Soldiers" , "Naval service" , "forces" , "Seminar for American troops" .)

I've seen this clue in the Evening Standard.
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