Some antiquated Danish or Icelandic poems (4)
I believe the answer is:
edda
'icelandic poems' is the definition.
(I've seen this before)
'some antiquated danish or' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'EDDA' can be found hidden inside 'antiquated danish or'.
(Other definitions for edda that I've seen before include "Icelandic myth collection" , "Nordic verses" , "anthology" , "book of poems" , "mythological book" .)