Answer: umpiring

AnswerCrossword Clue
UMPIRINGCalling strikes, e.g.
UMPIRINGActing as an arbiter.
UMPIRINGCalling at home, say
umpiringrules official in certain sports
umpiringUMPIRE, to rule on the plays in a game
umpiringto decide or act as umpire