Rodent seen in raging stream behind hotel (7)
I believe the answer is:
hamster
'rodent' is the definition.
(hamster is a kind of rodent)
'raging stream behind hotel' is the wordplay.
'raging' indicates anagramming the letters.
'behind' means one lot of letters go next to another.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'stream' with letters rearranged gives 'amster'.
'amster' put after 'h' is 'HAMSTER'.
'seen in' acts as a link.
(Other definitions for hamster that I've seen before include "Kind of rodent with cheekpouches, often a pet" , "The arms (anag)" , "Pet rodent, may be golden" , "Small pet rodent with pouched cheeks" , "Short-tailed burrowing rodent" .)