Pastoral verse (5)
'pastoral verse' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for idyll that I've seen before include "Charming pastoral scene" , "Pictorial poem" , "Poem or scene of rustic simplicity" , "Picturesque pastoral scene" , "Utopian scene" .)
(Other definitions for eclogue that I've seen before include "Bucolic" , "Lines written" , "pastoral work" , "Short pastoral poem" , "country-specific text" .)