Aquatic creature a printer trained (8)
I believe the answer is:
terrapin
'aquatic creature' is the definition.
The answer and definition can be both animals as well as being singular nouns.
I also know that 'creature' relates to this answer.
'a printer trained' is the wordplay.
'trained' indicates an anagram (train can mean to shape or manipulate).
'a'+'printer'='aprinter'
'aprinter' with letters rearranged gives 'TERRAPIN'.
Can you help me to learn more?
(Other definitions for terrapin that I've seen before include "A reptile; a printer (anag.)" , "edible, freshwater reptile" , "Hardback" , "Water tortoise" , "Web-footed turtle" .)