Crossword Puzzle Nixon's Checkers, for one

Clue: Nixon's Checkers, for one

Nixon treaty subj. (ABM with 3 letters)
Spot checkers? (e.g. ADMEN with 5 letters)
Spot checkers (ADMEN with 5 letters)
Spiro who served with Nixon (AGNEW with 5 letters)
He served with Nixon (AGNEW with 5 letters)
Spell checkers (AMULETS with 7 letters)
Left oneÂ’s seat (AROSE with 5 letters)
Actor, Nixon administration speechwriter, and game show host Stein (BEN with 3 letters)
Checkers of entries, for short (CPAS with 4 letters)
Nixon's sextet (CRISES with 6 letters)