10 across
Some
included
Dahl’s
old
tales
(4)
Some included Dahl’s old tales (4)
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The definition is at the end of the clue.
How the clue works
Look at old tales — that's your definition, pointing to the Old Norse Eddas. "Some" is the hidden word indicator, and sure enough, ED DA is lurking right there inside "includ**ED DA**hl's".