4 words for DOUW 1-letter words

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1 letter (4)

d o u w
E.g. Puccini’s Che gelida manina
?
A
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R
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I
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A
Hint 1 meaning
An air or song; a melody; a tune.
Hint 2 anagram
IARA
Hint 3 another clue
Solo
9 +2