Ringer

n.	1.	One who, or that which, rings; especially, one who rings chimes on bells.
	2.	(Mining) A crowbar.
	1.	(Horse Racing) A horse that is not entitled to take part in a race, but is fraudulently got into it.

Noun	1.	ringer - a person who rings church bells (as for summoning the congregation) Synonyms: bell ringer, toller
	2.	ringer - a person who is almost identical to another Synonyms: clone, dead ringer
	3.	ringer - a contestant entered in a competition under false pretenses
	4.	ringer - (horseshoes) the successful throw of a horseshoe or quoit so as to encircle a stake or peg

agent, alternate, alternative, analogy, backup, blagueur, bluff, bluffer, change, changeling, charlatan, comparison, copy, counterfeit, deputy, double, dummy, equal, equivalent, ersatz, exchange, fake, faker, fill-in, fourflusher, fraud, ghost, ghostwriter, humbug, imitation, impersonator, impostor, locum tenens, makeshift, malingerer, metaphor, metonymy, mountebank, next best thing, personnel, phony, picture, pinch hitter, portrait, poser, poseur, pretender, proxy, quack, quacksalver, quackster, relief, replacement, representative, reserves, saltimbanco, second string, secondary, sham, shammer, sign, simulacrum, spares, spit, spitting image, stand-in, sub, substituent, substitute, substitution, succedaneum, superseder, supplanter, surrogate, symbol, synecdoche, third string, token, understudy, utility player, vicar, vice-president, vice-regent