A printer appears to turn turtle (8)
I believe the answer is:
terrapin
'turtle' is the definition.
(I know that terrapin is a type of turtle)
'a printer appears to turn' is the wordplay.
'appears' says to put letters next to each other (some letters appear after others).
'to turn' is an anagram indicator (letters turn into something else).
'a'+'printer'='aprinter'
'aprinter' is an anagram of 'TERRAPIN'.
(Other definitions for terrapin that I've seen before include "A reptile; a printer (anag.)" , "Aquatic tortoise" , "Small freshwater turtle" , "Hardback" , "freshwater creature" .)