Answer:

umps

Answer	Crossword Clue
UMPS	Referee's kin
UMPS	Works at home?
UMPS	They clean plates

UMPS	They're frequently "blind"
UMPS	VIP's of the diamond
UMPS	Strike callers
UMPS	Diamond arbiters
UMPS	Diamond rulers
UMPS	Figures at plates
UMPS	Fenway arbiters
UMPS	Diamond staffers

UMPS	Face-mask wearers
UMPS	Boo targets, sometimes
UMPS	Targets of 54-Acrosses
UMPS	Calls the game
UMPS	Foul callers
UMPS	Ballpark figures
UMPS	Men in black, usually
UMPS	They're usually assigned to bases

UMPS	Home bodies?
UMPS	Masked men at home?
UMPS	Tag determiners
UMPS	World Series sextet
UMPS	Out callers
UMPS	Some Little League volunteers
UMPS	Ballpark arbiters
UMPS	Diamond figures

UMPS	Officials at home?
UMPS	Shea officials
UMPS	Calls balls
UMPS	Diamond judges
UMPS	Ballpark bosses
UMPS	Basketball : refs :: baseball : ...
UMPS	Call makers at the plate
UMPS	Diamond VIPs

UMPS	Field officials
UMPS	Home boys?
UMPS	Officials at the plate
UMPS	They call out "Out!"
UMPS	Baseball VIPs