Magical words in poem, as seen in translation (4,6)
I believe the answer is:
open sesame
'magical words' is the definition.
(I've seen this before)
'poem as seen in translation' is the wordplay.
'in translation' indicates anagramming the letters (translate can mean to transform).
'poem'+'as'+'seen'='poemasseen'
'poemasseen' is an anagram of 'OPEN SESAME'.
'in' acts as a link.
(Other definitions for open sesame that I've seen before include "door-unlocking spell" , "spelling words?" , "Magical words" , "free entry" , "Words of Ali Baba" .)