Rue posh, distressed musician mourning his wife (7)
I believe the answer is:
orpheus
'musician mourning his wife' is the definition.
The definition suggests a singular noun which matches the answer.
'rue posh distressed' is the wordplay.
'distressed' is an anagram indicator.
'rue'+'posh'='rueposh'
'rueposh' anagrammed gives 'ORPHEUS'.
Can you help me to learn more?
(Other definitions for orpheus that I've seen before include "Legendary musician" , "Lyre player who could charm all living things" , "In Greek myth, poet who followed Eurydice into the Underworld" , "Lyre player of myth" , "Thracian poet" .)