Creature disturbing the rams (7)
I believe the answer is:
hamster
'creature' is the definition.
(hamster is a kind of creature)
'disturbing the rams' is the wordplay.
'disturbing' indicates anagramming the letters (I've seen this in other clues).
'the'+'rams'='therams'
'therams' with letters rearranged gives 'HAMSTER'.
(Other definitions for hamster that I've seen before include "Rodent often kept as pet" , "Oddly, the arms of a rodent" , "Common pet rodent" , "Animal" , "The arms (anag)" .)