Answer:

REF

Answer	Crossword Clue
REF	Foul caller
REF	"Zebra," in football slang
REF	NHL OFF.

REF	TD caller
REF	TKO caller
REF	Zebra, in sports?
REF	Court caller
REF	He's in the midst of a fight
REF	Rink official
REF	Third man in the ring
REF	Ump's kin?

REF	One who cries foul?
REF	Ump
REF	Ump's colleague
REF	Ump's kin
REF	Ump's relation
REF	Umpire's counterpart
REF	Ump's cousin
REF	Court whistler

REF	One in a tight shirt with a little whistle
REF	Official whose eyesight is often called into question
REF	Ring figure
REF	Lord of the ring
REF	NFL "zebra"
REF	Ring official
REF	Arbiter, for short
REF	Ump's gridiron counterpart

REF	Gridiron arbiter
REF	Whistle-blower
REF	Arbiter
REF	Court arbiter
REF	Sport authority
REF	Zebra on a field
REF	Zebra with a whistle
REF	Gridiron zebra

REF	"Zebra" on the field
REF	Ump's relative
REF	Whistle-blower, say
REF	Bk. used for look-ups
REF	Fight stopper, perhaps