Crossword Genius

At sea, can keep crews moving (5)

Ross

I believe the answer is:

screw

I'm a little stuck... Click here to teach me more about this clue!

'at sea can keep' is the definition.
I can't judge whether this definition defines the answer.

'crews moving' is the wordplay.
'moving' is an anagram indicator (letters are moved around).
'crews' is an anagram of 'SCREW'.

Can you help me to learn more?

(Other definitions for screw that I've seen before include "Archimedes' invention" , "con" , "may need a driver" , "Fastener, rivet" , "Bring pressure to bear" .)

I've seen this clue in the Evening Standard.
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