Rodent the rams disturbed (7)
I believe the answer is:
hamster
'rodent' is the definition.
(hamster is a kind of rodent)
'the rams disturbed' is the wordplay.
'disturbed' is an anagram indicator.
'the'+'rams'='therams'
'therams' anagrammed gives 'HAMSTER'.
(Other definitions for hamster that I've seen before include "Kind of rodent with cheekpouches, often a pet" , "Pet rodent, may be golden" , "Oddly, the arms of a rodent" , "Rodent often kept as pet" , "Small pet rodent with pouched cheeks" .)