I read this in an article in NYT. I tried searching Google, and also looked through a number of dictionaries, but no help. Any one can help?
closed as off-topic by Mari-Lou A, AmE speaker, Davo, jimm101, MetaEd Oct 31 '17 at 16:39
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As people have explained, denizen and swamp are both easy to look up. You have not supplied a quote to give the context of the phrase's use but I'd assume this is it:
Mr. Manafort, in other words, embodies the sort of amoral, self-dealing denizen of the swamp that Mr. Trump pledged to drain when he got to Washington.
and therefore it is not be read as literally referring to a person who lives in a boggy place.
President Trump promised to 'drain the swamp', in doing so he is part of a long continuum of American politicians to use the phrase to refer to either excessive bureaucracy or to corruption within the federal government in Washington.
The origins of the phrase are a metaphorical reference to the belief that Washington is built on a swamp and is hence an unhealthy environment. This source clarifies that the physical swampiness has been much overstated.
Within the original city’s boundaries (the area south of Florida Avenue), only about 2 percent of the total area fits the definition of a swamp. It was almost entirely laid out over well-drained terraces and hills. In fact, for a riverside site, it was amazingly free of swampiness.
The meaning, in context, of the phrase being that Manafort is the kind of person the president promised to rid Washington of but has instead introduced there.
In this context this particular definition of 'denizen' from the OED (subscriber access only) becomes the most apposite, though whether that was the intention of the author it is difficult to be sure:
In Natural Hist., A plant or animal believed to have been originally introduced by human agency into a country or district, but which now maintains itself there as if native, without the direct aid of man; cf. colonist n. 2.
'Denizen', according to the Merriam Webster Dictionary, means "Habitue" or say, one who resides at a specific place. So, 'Denizen of the swamp' can be used for someone that resides in a swampy place.