Spat tooth out, or a copy (9)
I believe the answer is:
photostat
'a copy' is the definition.
(I know that photostat is a type of photocopy)
'spat tooth out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'spat'+'tooth'='spattooth'
'spattooth' anagrammed gives 'PHOTOSTAT'.
'or' is the link.
(Other definitions for photostat that I've seen before include "Copying machine" , "Reproduced copy" .)