Answer:

MIO

Answer	Crossword Clue
MIO	"O Sole .."
MIO	"O Sole ..."
MIO	"O sole .."

MIO	Mine in Monterrey
MIO	"'O Sole ..'"
MIO	"O Sole ..." (operatic song)
MIO	Puccini's "O ... babbino caro"
MIO	Italian possessive
MIO	"O .. babbino caro": Puccini aria
MIO	Italian mine
MIO	Italian possessive pronoun

MIO	Mine in Rome
MIO	Padua possessive
MIO	"O ... babbino caro" (Puccini aria)
MIO	"'O Sole ..."
MIO	My, in Milan
MIO	Mine, to Marcello
MIO	"O sole ..."
MIO	Mine in Milan

MIO	Apennines possessive
MIO	""O Sole ..""
MIO	Panamanian pronoun
MIO	"Don Giovanni" pronoun
MIO	Italian pronoun
MIO	"Il ... tesoro" ("Don Giovanni" aria)
MIO	"Cantar de ... Cid" (Spanish epic poem)
MIO	Smaller: Comb. form.

MIO	"O sole ...."
MIO	Italian pronoun.
MIO	"O Sole ...."
MIO	Spanish possessive.
MIO	"Winterset" hero.
MIO	Mine: Sp.
MIO	Italian possessive.
MIO	Mine: It.

MIO	My: It.
MIO	My, in Naples
MIO	Mine, in Italy
MIO	"Winterset" hero
MIO	"Dio ...!"