Crossword Genius

Dognapper ultimately snatched Dalmatian for one? (4)

Ross

I believe the answer is:

coat

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for coat that I've seen before include "blanket" , "Layer of paint" , "Ulster, perhaps" , "Outer covering" , "Overgarment" .)

I've seen this clue in The Independent.
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