A man hired at a muster to appear as a soldier. To faggot in the canting sense, means to bind: an allusion to the faggots made up by the woodmen, which are all bound. Faggot the culls; bind the men.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
See also the definition in Nathan Bailey's 1736 dictionary of canting and thieving slang.
Fagger * FaithfulNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes