Crossword Puzzle Nasty people

Clue: Nasty people

People with reservations in New York (SENECA with 6 letters)
Why there are so many tree people in this puzzle? (BYPOPLARDEMAND with 14 letters)
Cat Nation people (e.g. ERIE with 4 letters)
Org. for people 50 and over (AARP with 4 letters)
Jack Nasty (SNEAK with 5 letters)
Had people over (ENTERTAINED with 11 letters)
Himalayan people (e.g. NEPALIS with 7 letters)
People often stick with it (GLUE with 4 letters)
Cochise's people (APACHE with 6 letters)
Dispassionate people (STOICS with 6 letters)