Crossword Genius

Where stockholders make a killing? (8)

Ross

I believe the answer is:

abattoir

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'where stockholders make a killing?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

This is the entire clue.

Can you help me to learn more?

(Other definitions for abattoir that I've seen before include "it makes a killing" , "It might make a killing" , "scene of slaughter" , "Animal slaughter-house" , "shambles once" .)

I've seen this clue in The Guardian.
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