Answer: theas

AnswerCrossword Clue
THEAS

Oakland squad

THEAS

O.co Coliseum squad

THEAS

"Moneyball" team, for short

THEAS
Oakland team, to fans
THEAS
Oakland nine, to fans
THEASCalifornia nine, to fans
THEASOakland ballclub
THEASMLB team, familiarly (and what's missing from the sequence found in the answers to starred clues?)
THEASAmerican League team
THEAS'89 World Series winners
THEAS2003 ALDS team
THEASWorld Series champs, 1972-74
THEASCalifornia team [and 18 letters in the grid to circle ... and then connect using three lines]
THEASThree-time '70s World Series champs