Choir upset by the blood of gods (5)
I believe the answer is:
ichor
'blood of gods' is the definition.
'ichor' can be an answer for 'blood' (I have seen 'Superior blood' mean 'ichor' so perhaps 'blood' could also mean 'ichor'). I am not certain of the 'of gods' bit.
'choir upset by the' is the wordplay.
'choir' can be anagrammed to 'ICHOR'.
Though, I'm not sure how the anagram is indicated.
Can you help me to learn more?
(Other definitions for ichor that I've seen before include "Choir (anag) - fluid that flows in the veins of the gods" , "Blood-fluid of the gods" , "Blood of the ancient gods" , "Blood of the gods found in choir" , "flowed through Hades?" .)