Kills outside rodent after grain: creature no longer living (11)

I believe the answer is:

triceratops

I'm a little stuck... Click here to teach me more about this clue!

'grain creature no longer living' is the definition.
I can't judge whether this definition defines the answer.

'kills outside rodent' is the wordplay.
'kills' becomes 'tops'.
'outside' indicates putting letters inside.
'rodent' becomes 'ricerat' (rice rat is a kind of rodent).
'tops' going around 'ricerat' is 'TRICERATOPS'.

'after' acts as a link.

Can you help me to learn more?

(Other definitions for triceratops that I've seen before include "Extinct reptile" , "Three-horned dinosaur" , "Old creature" , "Horned dinosaur" , "Cretaceous herbivore" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.