Poem model outsiders ignored (3)
I believe the answer is:
ode
'poem' is the definition.
(ode is a type of poem)
'model outsiders ignored' is the wordplay.
'outsiders ignored' means to look at the middle letters (letters on the outside are removed).
The middle letters of 'model' are 'ODE'.
(Other definitions for ode that I've seen before include "Poetic composition" , "Lines" , "Lyric poem" , "(Railway)system" , "Verse form" .)