Pet that is a 45-Across (7)

I believe the answer is:

hamster

(Other definitions for hamster that I've seen before include "Rodent often kept as pet" , "Common pet rodent" , "Kind of rodent with cheekpouches, often a pet" , "one running round in circles?" , "Rodent with large cheek pouches" .)

I've seen this clue in the Universal.

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