Crossword Genius

Does he keep watch on board? (6,7)

Ross

I believe the answer is:

second officer

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'keep watch on board?' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'does he' is the wordplay.
I cannot really understand how this works, but
'he' could be 'con' and 'con' is found within the answer.
an anagram of 'does' is 'sedo' which is located in the remaining letters.
This explanation may well be incorrect...

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