Answer: staunch

AnswerCrossword Clue
STAUNCHTried and true
STAUNCHLoyal
STAUNCHFiercely loyal
STAUNCHSteadfast
STAUNCHFirm
STAUNCHUnwavering.
STAUNCHSteadfast: Var.
STAUNCHNot fickle
STAUNCHLoyally unflinching
STAUNCHTrue-blue
staunchto stop the flow of blood, also STANCH / firm and dependable, also STANCH
staunchLoyal and committed in attitude
staunch(of a wall) Of strong or firm construction
staunch(of a ship) Watertight