Answer: infieldfly

AnswerCrossword Clue
INFIELDFLYUmp's call on a pop-up, perhaps
INFIELDFLYPop-up on a diamond
INFIELDFLYShort pop-up
INFIELDFLYCall on the diamond
INFIELDFLYBaseball play
INFIELDFLYBaseball pop-up
INFIELDFLYPop-up.
INFIELDFLYGnat at home plate?