Answer:

fallinlove

Answer	Crossword Clue
FALLINLOVE	Lose one's heart?
FALLINLOVE	Become enamored
FALLINLOVE	"Let's ... " (romantic suggestion from Eddy Duchin and others)

FALLINLOVE	Become smitten
FALLINLOVE	Lose one's heart
FALLINLOVE	Indulge in a spring fancy
FALLINLOVE	Let's do it
FALLINLOVE	Union: first stage
FALLINLOVE	Lose every set of a tennis match 6-0?
FALLINLOVE	Get hit by one of Cupid's arrows