Crossword Genius

Slasher presumably showing vamp with a different origin (7)

Ross

I believe the answer is:

reducer

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'origin' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for reducer that I've seen before include "that has a weakening effect?" , "One making weaker" , "Piece for joining pipes of differing diameter" , "Agent used when developing" , "I get less" .)

I've seen this clue in The Independent.
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