Animals snorted when whipped (7)
I believe the answer is:
rodents
'animals' is the definition.
(rodent is a kind of animal)
'snorted when whipped' is the wordplay.
'when whipped' is an anagram indicator (letters whipped into a new form).
'snorted' with letters rearranged gives 'RODENTS'.
(Other definitions for rodents that I've seen before include "Mice, squirrels etc" , "Eg, mice" , "Guinea pigs, hamsters etc" , "Animals that gnaw" , "Rats, mice, hamsters" .)