Answer: stoking

AnswerCrossword Clue
STOKINGTending, as a fire
STOKINGAdding fuel to
STOKINGFireman's function
STOKINGStirring up the fire.
STOKINGStirring up
STOKINGFeeding
STOKINGFeeding, as a fire
stokingSTOKE, to supply a furnace with fuel
stokingto stir up and feed (a fire)