Answer:

rocks

Answer	Crossword Clue
ROCKS	Feature of some gardens
ROCKS	Diamonds, in slang
ROCKS	Ice in a bar

ROCKS	Is way cool
ROCKS	Cocktail coolers
ROCKS	Coolers of drinks
ROCKS	Drink coolers, slangily
ROCKS	Ice, at the bar
ROCKS	Ice, in bar lingo
ROCKS	Sways back and forth
ROCKS	Soothes a baby

ROCKS	Boulders
ROCKS	Unsettles
ROCKS	Shakes up
ROCKS	Shakes severely
ROCKS	Performs great, so to speak
ROCKS	Tilts back and forth.
ROCKS	Subject of petrology.
ROCKS	Ice cubes.

ROCKS	Plymouth and Inchcape
ROCKS	"I love thy ... and rills"
ROCKS	Sways
ROCKS	Barkeep's ice
ROCKS	Mariners' danger
ROCKS	Is extremely cool, slangily
ROCKS	Petrographer's collection
ROCKS	Makes some music, like the Stones

ROCKS	Puts out some hot, swinging music
ROCKS	Is too cool
ROCKS	Ice cubes, slangily
ROCKS	Jams with Aerosmith
ROCKS	Performs "Stairway to Heaven"
ROCKS	Ice, to a mixologist
ROCKS	Performs "Stairway to Heaven," e.g.
ROCKS	Makes like the Stones

ROCKS	Cocktail coolers, slangily
ROCKS	Money
ROCKS	Neil Diamond's "Love on the ..."
ROCKS	Highball chiller
ROCKS	What lava becomes after an eruption