Rebecca and I swapped animal (4)

I believe the answer is:

ibex

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'animal' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

(Other definitions for ibex that I've seen before include "Sure-footed climber" , "Mountain goat with long curved horns" , "Wild goat of North Africa" , "Large-horned mountain goat" , "Wild goat with large recurved horns" .)

I've seen this clue in The Independent.

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