Crossword Genius

Stories after Edda initially included poetic reversal (8)

Ross

I believe the answer is:

anapaest

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'poetic reversal' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'stories after edda initially included' is the wordplay.
'stories' becomes 'ana' (archaic term for anecdotes or gossip).
'after' becomes 'past' (I've seen this in another clue).
'initially' suggests taking the first letters.
'included' indicates putting letters inside.
The first letter of 'edda' is 'e'.
'past' going around 'e' is 'paest'.
'ana'+'paest'='ANAPAEST'

Can you help me to learn more?

(Other definitions for anapaest that I've seen before include "involved in the destruction of Sennacherib?" , "Metrical foot with two syllables followed by one stressed syllable - try a peasant" , "part of a line of verse" .)

I've seen this clue in The Independent.
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