Answer: zeroing

AnswerCrossword Clue
ZEROINGResetting, in a way
ZEROINGKilling, as a bill
ZEROINGClosing (in on)
ZEROINGFine tuning
ZEROINGTargeting (with "in on")
ZEROINGHoming (in on)
zeroingAdjust (an instrument) to zero
zeroingSet the sights of (a gun) for firing
zeroingZERO, to aim at the centre of a target