Human double (9,4)
I believe the answer is:
identical twin
(Other definitions for identical twin that I've seen before include "Lookalike sibling" , "One of two from the same fertilised egg" .)
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.