Crossword Genius

One sharing a spine with me? (8)

Ross

I believe the answer is:

coauthor

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

'one sharing a spine with me?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

This is the entire clue.

Can you help me to learn more?

(Other definitions for coauthor that I've seen before include "Collaborator in writing of book" , "Each of two writers of a book" , "Joint writer" .)

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.