Creature runs riot in Amherst (7)
I believe the answer is:
hamster
'creature' is the definition.
(hamster is a kind of creature)
'runs riot in amherst' is the wordplay.
'amherst' can be anagrammed to 'HAMSTER'.
However, I'm not clear how the anagram is indicated.
Can you help me to learn more?
(Other definitions for hamster that I've seen before include "Animal" , "Oddly, the arms of a rodent" , "Rodent with large cheek pouches" , "Kind of rodent with cheekpouches, often a pet" , "Furry pet" .)