Copy what's in the paper (3)
I believe the answer is:
ape
'copy' is the definition.
(ape can mean to copy or imitate)
'in the paper' is the wordplay.
'in' says the answer is hidden in the clue.
'APE' is hidden within 'the paper'.
'what's' acts as a link.
(Other definitions for ape that I've seen before include "Imitate, clumsy person (colloq.)" , "Idiot" , "Anthropoid primate" , "Copy - primate" , "gorilla" .)