Sour guests worried about a former herbivore (11)
I believe the answer is:
stegosaurus
'former herbivore' is the definition.
The definition and answer can be both animals as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'sour guests worried about a' is the wordplay.
'worried' indicates anagramming the letters.
'about' means one lot of letters goes inside another.
'sour'+'guests'='sourguests'
'sourguests' anagrammed gives 'stegosurus'.
'stegosurus' going around 'a' is 'STEGOSAURUS'.
Can you help me to learn more?
(Other definitions for stegosaurus that I've seen before include "one from Jurassic Park?" , "Sort of dinosaur" , "Dinosaur with bony plates along the back" .)