Here are the possible solutions for jazz singer o'day clue
Answer
Clue
Relevancy
anita
Clue
Jazz singer O'Day
Jazz singer ODay
etta
Clue
"Seven Day Fool" soul/jazz singer James
aljolson
Clue
"The Jazz Singer" singer
eternal
Clue
Day after day after day . . .
Definition
everlasting, also ETERNE
june
Clue
It has both National Cheese Day and National Cognac Day ... on the same day no less
kennyg
Clue
"For his contributions to jazz, ___ should be smeared with bacon grease, placed in a cage with three underfed Kodiak grizzly bears, and whatever happens, happens." ("Genius Guide to Jazz")
teams
Clue
Jazz and Blues, but not smooth jazz or jump blues, AFAIK