While reading Swift's "A Description of a City Shower" (1710) I met the following two lines:
The Templar spruce, while every spout’s abroach,
Stays till ’tis fair, yet seems to call a coach.
It is fairly clear from the context that these lines describe a dapper law student(or a lawyer?) caught in a sudden shower.
What is less clear, however, is the part of speech the word "spruce" belongs to here. From the word order it seems to be a noun, yet no dictionary I have checked, not even OED, lists that word as such in the sense of someone neatly dressed.
So what part of speech is it? Is it a postpositive adjective? (If so, was it used for the sake of poetic fluidity, or was it a common grammatical feature back then?) Was the word turned into a noun by the potent magic of poetry?