Camels graveyards? (8)

I believe the answer is:

ashtrays

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'camels graveyards?' is the definition.
Although both the answer and definition are plural nouns, I don't see how they can define each other.

This is all the clue.

Can you help me to learn more?

(Other definitions for ashtrays that I've seen before include "smokers' necessities" , "Receptacles for smokers" , "where fags end up" , "Receptacles for tobacco detritus" , "butts in these?" .)

I've seen this clue in The Independent.

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