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Eighteen lives represented. Can you beat it? (3-3)

Ross

I believe the answer is:

tom-tom

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

'eighteen' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for tom-tom that I've seen before include "Cylindrical drum" , "Hand-beaten drum" , "Repetitive cat on the drum" , "African drum beaten with hands, sounds repetitive" , "African drum on the double?" .)

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