Got frills out of pageant hymn (5)
I believe the answer is:
paean
'hymn' is the definition.
(I've seen this in another clue)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for paean that I've seen before include "Encomium, eulogy" , "Formal expression of praise" , "work building up" , "A song of triumph or praise" , "Panegyric" .)