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Checks out some Cat Stevens' backtrack (4)

Ross

I believe the answer is:

vets

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'checks out' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for vets that I've seen before include "Checks out" , "Screens the animal doctors" , "Examines the animal doctors carefully?" , "Siegfried and Tristan Farnon, for example" , "Thoroughly examines" .)

I've seen this clue in The Irish Times.
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