Viking saga entertained Danes to a certain extent (4)

I believe the answer is:

edda

I'm a little stuck... Click here to teach me more about this clue!

'viking saga' is the definition.
'edda' can be an answer for 'saga' (I've seen this before). I am unsure of the 'viking' bit.

'entertained danes to a certain extent' is the wordplay.
'EDDA' is hidden within the letters.
However, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for edda that I've seen before include "Collection of Norse poems" , "Foreign literature" , "Icelandic myth collection" , "Lots of old lines" , "mythological book" .)

I've seen this clue in The Telegraph.

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