Celebratory poem (3)
I believe the answer is:
ode
'celebratory poem' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ode that I've seen before include "Poetic composition" , "(Railway)system" , "- - to a 12 Urn" , "Sung poem" , "Verse form" .)