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Perhaps a fatal attraction, ducky! (5)

Ross

I believe the answer is:

decoy

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'ducky' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

I don't understand the rest of the clue.

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(Other definitions for decoy that I've seen before include "Imitation creature used to attract others" , "Entrap" , "Thing used to lure animal into trap" , "Red herring" , "It's used to lead into a trap" .)

I've seen this clue in the Evening Standard.
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