“"Seriously, though ..." or a hint to 17-, 25-, 48- and 58-Across”

Las ___, Canary Islands

Device with an addictive aerosol, for short

Plant, as seeds

Laid back

"Hello ___" (smartphone tagline)

"That's terrible!"

Campfire cookout, informally

Crafty

Jake ___, 1980 Oscar-winning role for Robert De Niro