Yell, like great soprano! (6)
I believe the answer is:
callas
'great soprano' is the definition.
'callas' can be an answer for 'soprano' (Maria Callas). I'm unsure of the 'great' bit.
'yell like' is the wordplay.
'yell' becomes 'call' (synonyms).
'like' becomes 'as'.
'call'+'as'='CALLAS'
Can you help me to learn more?
(Other definitions for callas that I've seen before include "Great Greek American soprano" , "Superb soprano of Greek background" , "Maria, Greco-American soprano" , "Arguably, the greatest diva of them all" , "Greek diva" .)