Blood is full of good stuff (5)
I believe the answer is:
gorge
'stuff' is the definition.
(synonyms)
'blood is full of good' is the wordplay.
'blood' becomes 'gore' (synonyms).
'is full of' indicates putting letters inside.
'good' becomes 'g' (abbreviation).
'gore' going around 'g' is 'GORGE'.
(Other definitions for gorge that I've seen before include "Defile; stuff oneself" , "Stuff oneself (with) - Cheddar, for example" , "Cheddar, say" , "Eat too much" , "Deep valley" .)