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Crew member: he maps it at sea (8)

Ross

I believe the answer is:

shipmate

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'crew member' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe there's a link between them I don't understand?

'he maps it at sea' is the wordplay.
'at sea' indicates an anagram.
'he'+'maps'+'it'='hemapsit'
'hemapsit' with letters rearranged gives 'SHIPMATE'.

Can you help me to learn more?

(Other definitions for shipmate that I've seen before include "Fellow sailor" , "Fellow crew member" , "Fellow crewman" , "Colleague on board" , "Fellow seaman" .)

I've seen this clue in The Sun.
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