Answer:

mopsy

Answer	Crossword Clue
MOPSY	Flopsy's pal
MOPSY	Sib of Peter Rabbit
MOPSY	Sister of Peter Rabbit

MOPSY	Beatrix Potter bunny
MOPSY	Peter Rabbit sibling
MOPSY	Sibling of Peter Rabbit and Cottontail
MOPSY	Cottontail buddy
MOPSY	Peter Rabbit's sister
MOPSY	Fictional rabbit
MOPSY	Potter character
MOPSY	Peter Rabbit's sibling

MOPSY	One of Cotton-tail's siblings
MOPSY	Potter rabbit
MOPSY	Relative of Peter Rabbit.
MOPSY	Relative of Cottontail and Peter.
MOPSY	Fictional rabbit.
MOPSY	One of Peter Rabbit's sisters.
MOPSY	Member of Peter Rabbit's family.
MOPSY	Well-known rabbit.

MOPSY	Rabbit of tale.
MOPSY	Storied rabbit.
MOPSY	Relative of Peter Rabbit
MOPSY	A sibling of Cottontail
MOPSY	Storied rabbit
MOPSY	Cottontail's kin
MOPSY	Beatrix Potter rabbit
MOPSY	One of Peter Rabbit's siblings