Answer:

tartness

Answer	Crossword Clue
TARTNESS	Granny Smith quality
TARTNESS	Sourball quality
TARTNESS	Bite

TARTNESS	Pucker upper
TARTNESS	Sharpness of language.
TARTNESS	Sharp taste.
TARTNESS	Feature of Granny Smiths
TARTNESS	Pungency
TARTNESS	Crab apple's quality
TARTNESS	Quality of some apples
TARTNESS	Feature of Granny Smith apples

TARTNESS	Vinegary quality