Answer: sky

AnswerCrossword Clue
SKY

Certain diver's milieu

SKY

Optimist's limit

SKYOptimist's limit?
SKY

Wild blue yonder

SKY
Cloud cover
SKY
Light-pollution site
SKY... One (British TV channel)
SKYAzure expanse
SKYSun spot?
SKYLead-in for line or scraper
SKYThe limit, proverbially
SKYWhat's up?
SKYCloud locale
SKYHeavens
SKYKind of blue
SKYCloud backdrop
SKYLimitless limit?
SKYLight or line lead-in
SKYMuch of a sunset photo
SKYPlace to dive from
SKYIt's way over your head
SKYHit high, as a fly ball
SKYBlue shade
SKYIt's overhead
SKYShade of blue
SKYContrail locale
SKYDiver's milieu
SKYPlanetarium vista
SKYThe view above
SKY..-high
SKY"What Would I Want? ..." (Animal Collective song)
SKY".. King" (old TV show)
SKYCharacter who sings "Luck Be A Lady" in "Guys and Dolls"
SKY"Guys and Dolls" guy
SKYSetting of the sun
SKYKing of early TV
SKYFolksinger Patrick
SKYIt's often looked up to
SKYDaydreamer's limit?
SKYFirmament