Animal trapped in severe weather (3)
I believe the answer is:
ewe
'animal' is the definition.
(I know that ewe is a type of herbivore)
'trapped in severe weather' is the wordplay.
'trapped in' indicates a hidden word.
'EWE' is hidden within 'severe weather'.
(Other definitions for ewe that I've seen before include "Lamb's mother" , "Language" , "Scottish loch" , "The sort of beast" , "One needing pastoral care" .)