Answer:

enclosure

Answer	Crossword Clue
ENCLOSURE	Pen, e.g.
ENCLOSURE	Ring or rink
ENCLOSURE	SASE, e.g.

ENCLOSURE	Check, often
ENCLOSURE	A check inside a letter, for instance.
ENCLOSURE	Paddock or corral.
ENCLOSURE	Corral.
ENCLOSURE	Pen
ENCLOSURE	Pen, say