Crossword Genius

One that kills headless chicken, potentially? (5)

Ross

I believe the answer is:

layer

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'one that kills headless chicken potentially?' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

This is the entire clue.

Can you help me to learn more?

(Other definitions for layer that I've seen before include "plate?" , "Single thickness and hen" , "Stratum, tier" , "Blanket - single thickness" , "One of several thicknesses" .)

I've seen this clue in The Independent.
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