Verse in Ariosto delightful (3)
I believe the answer is:
ode
'verse' is the definition.
(I've seen this in another clue)
'in ariosto delightful' is the wordplay.
'in' indicates a hidden word.
'ODE' can be found hidden inside 'ariosto delightful'.
(Other definitions for ode that I've seen before include "poetry" , "Lyric poem" , "Verse form" , "A poem celebrating person or event" , "Literary work" .)