Crossword Genius

Choppers seen out in middle of night? (8)

Ross

I believe the answer is:

dentures

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

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for dentures that I've seen before include "Set of false teeth" , "Sets of artificial teeth." , "Underset in teeth" .)

I've seen this clue in The Sunday Times.
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