Carpenter with a coat of many colours? (6)

I believe the answer is:

joseph

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

'colours?' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's a link between them I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for joseph that I've seen before include "chap" , "Hebrew patriarch" , "OT dreamer" , "Biblical character with amazing dreamcoat on stage" , "Musical '. . . . . . and His Amazing Technicolor Dreamcoat'" .)

I've seen this clue in The Guardian.

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.