Hero worthy of a medal (4)
I believe the answer is:
lion
This might be a double definition.
'hero' is the first definition.
(thesaurus)
'worthy of a medal' is the second definition.
'lion' can be an answer for 'worthy' (thesaurus). I'm not sure about the 'of a medal' bit.
Can you help me to learn more?
(Other definitions for lion that I've seen before include "Carnivorous 6" , "King of the jungle" , "Simba, for example" , "Cowardly visitor in Oz" , "Big cat with pride" .)