Greeting from beaver (3)
I believe the answer is:
ave
'greeting' is the definition.
(Latin greeting)
'from beaver' is the wordplay.
'from' indicates the answer is hidden within the clue.
'AVE' can be found hidden inside 'beaver'.
(Other definitions for ave that I've seen before include "Hail as to Maria" , "Latin greeting" , "Hail (Latin)" , "Hello to the old Romans" , "Hail in graveyard." .)