Answer:

SPHERE

AnswerCrossword Clue
SPHEREGeometrical figure
SPHEREGlobe
SPHEREArena
SPHEREField of expertise
SPHEREPlanet
SPHEREDomain
SPHERERealm
SPHEREEarth, to Columbus
SPHEREOrb
SPHEREBall
SPHEREShape the world is in
SPHERERound figure
SPHEREBubble, e.g.
SPHEREAtmospheric layer suffix
SPHEREEarth, e.g.
SPHERERound shape
SPHERE1987 Michael Crichton best-seller
SPHEREField of influence
SPHEREHeavenly body
SPHEREField of activity
SPHEREEquator's locale
SPHEREIt may be social or celestial
SPHEREBall or globe
SPHEREArea of interest
SPHERESolid figure
SPHEREArea of influence
SPHERERegion of influence
SPHEREWord that can follow five prefixes hidden sequentially in the answers to starred clues
SPHERE.. of influence
SPHEREWheelhouse
SPHEREBailiwick
SPHERERange of influence
SPHERE3-D figure
SPHEREEarth's shape, roughly
SPHEREField of knowledge
SPHERECrichton thriller
SPHERERealm of expertise
SPHEREArea of expertise
SPHERECue-ball shape
SPHEREField