Crossword Genius

Proof of the fire picked up by consumers in the cafeteria containing the last of the Cubans

Ross

I believe the answer is:

ashtrays

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'cubans' is the definition.
Although both the answer and definition are plural nouns, I cannot see how they can define each other.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for ashtrays that I've seen before include "where fags end up" , "Receptacles for tobacco detritus" , "Receptacles for smokers" , "smokers' necessities" , "Receptacles removed from pub" .)

I've seen this clue in the Irish Times.
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