Eulogy upsetting gay prince (9)
I believe the answer is:
panegyric
'eulogy' is the definition.
(I know that eulogy can be written as panegyric)
'upsetting gay prince' is the wordplay.
'upsetting' is an anagram indicator.
'gay'+'prince'='gayprince'
'gayprince' anagrammed gives 'PANEGYRIC'.
(Other definitions for panegyric that I've seen before include "Laudatory address" , "Speech of praise" , "Speech or piece of writing praising person" , "Eulogy" , "encomium" .)