Crossword Genius

Something to batten down? (5)

Ross

I believe the answer is:

hatch

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'batten down?' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for hatch that I've seen before include "Devise" , "Think up" , "Sit on eggs" , "Mountain goat" , "contrive to > emerge in > shade" .)

I've seen this clue in the Evening Standard.
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