The ram's turned into a pet (7)
I believe the answer is:
hamster
'a pet' is the definition.
(I've seen this before)
'the ram's turned' is the wordplay.
'turned' indicates anagramming the letters.
'the'+'rams'='therams'
'therams' anagrammed gives 'HAMSTER'.
'into' is the link.
(Other definitions for hamster that I've seen before include "Kind of rodent with cheekpouches, often a pet" , "The arms (anag)" , "Common pet rodent" , "one running round in circles?" , "Furry pet" .)