Crossword Puzzle Cheaters of sorts

Clue: Cheaters of sorts

Office holder, of sorts (DESK with 4 letters)
Official in charge of sorts? (POSTMASTER with 10 letters)
Kind of offense (FEDERAL with 7 letters)
Make a change in a restaurant's postmeal offerings? (ADJUSTDESSERTS with 14 letters)
Balancer, of sorts (CPA with 3 letters)
Dairy offering (PASTEURIZEDMILK with 15 letters)
Installs in office (SEATS with 5 letters)
Official lang. of Guyana (ENG with 3 letters)
Office missives (MEMOS with 5 letters)
D.E.A. officer (NARC with 4 letters)