Right oven for joint? (5)

I believe the answer is:

roast

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

But I can't explain it at all! Could you help me understand?

(Other definitions for roast that I've seen before include "Become very warm" , "Oven-cooked joint" , "Grill" , "Reprimand severely" , "Give a telling off to - cook" .)

I've seen this clue in The Guardian and The Telegraph.

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.