Crossword Genius

As oldest pair err in famous poem? (8,4)

Ross

I believe the answer is:

paradise lost

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

'famous poem?' is the definition.
'Paradise Lost' can be an answer for 'poem?' (epic poem by John Milton). I am not certain of the 'famous' bit.

'as oldest pair err' is the wordplay.
'err' is an anagram indicator.
'as'+'oldest'+'pair'='asoldestpair'
'asoldestpair' is an anagram of 'PARADISE LOST'.

'in' is the link.

Can you help me to learn more?

(Other definitions for paradise lost that I've seen before include "Epic poem by Milton" , "Poem by 1" , "long poem" , "Work by Milton" , "disaster on cosmic scale" .)

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