Crossword Genius

Toy revolver (3)

Ross

I believe the answer is:

top

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

This clue could be a double definition.

'toy' is the first definition.
(I know that top is a type of toy)

'revolver' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?

Can you help me to learn more?

(Other definitions for top that I've seen before include "Upper side" , "Zenith" , "Spinner" , "Best" , "Uppermost part" .)

I've seen this clue in The Globe and Mail.
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