[noun] + まみれ [noun] + まみれ + の + [noun] [noun] + まみれ + になる
まみれ goes straight after a noun and means "covered in" it: smeared or soaked all over with something messy – blood, mud, sweat, oil, dust. It behaves like a noun, so it takes の before another noun and だ or です at the end of a sentence.
Before a noun it is always の, never な.
Debt and corruption also cover a person, figuratively: しゃっきん借金まみれ is "up to the neck in debt".
The verb behind the suffix is まみれる, "to be smeared", used with に: どろ泥にまみれる. Both are almost always written in kana.