Mediaeval work suffered damage, lots missing (4)

I believe the answer is:

edda

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'mediaeval work' is the definition.
'edda' can be an answer for 'work' (medieval Norse literary work). I'm not sure about the 'mediaeval' bit.

'suffered damage lots missing' is the wordplay.
'EDDA' is hidden in amongst the letters.
However, I'm uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for edda that I've seen before include "Icelandic myth collection" , "couple of books in Norse" , "Nordic verses" , "Old tales" , "Foreign literature" .)

I've seen this clue in The Times.

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