Previously found in poetry? (3)
I believe the answer is:
ere
'previously' is the definition.
(synonyms)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for ere that I've seen before include "One who steals" , "Before (in time)" , "Before (lit.)" , "Before, poetically" , "Old word for before" .)