Animal that followed not only Mary, but also Charles (4)
I believe the answer is:
lamb
'animal' is the definition.
(lamb is a kind of animal)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for lamb that I've seen before include "Meaty" , "Meekest" , "Sweet and innocent child" , "Tender sheep meat" , "Exemplar of innocence" .)