Exemplar of innocence (4)
I believe the answer is:
lamb
'exemplar of innocence' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for lamb that I've seen before include "Exemplar of innocence" , "Noted essayist - symbol of innocence" , "English essayist" , "Young ovine" , "A follower" .)