Answer:

sole

Answer	Crossword Clue
SOLE	Exclusive
SOLE	Flatfish
SOLE	Lone

SOLE	Plantar-wart locale
SOLE	Type of fillet
SOLE	A flatfish
SOLE	Dover fish
SOLE	Fish dish
SOLE	One and only
SOLE	.... survivor
SOLE	... proprietor

SOLE	Lifted
SOLE	Unique
SOLE	Filleted fish
SOLE	Dover specialty
SOLE	Pump part
SOLE	Only
SOLE	Oft-filleted fish
SOLE	Part of Oxford?

SOLE	Golf club's bottom
SOLE	Part of a pump
SOLE	Oxford's underside
SOLE	Unrivaled
SOLE	Only fish?
SOLE	Tread leaver
SOLE	Boot base
SOLE	Flat bottom?

SOLE	Thick shoe part
SOLE	It's often underfoot
SOLE	Target of a cobbler's repairs, often
SOLE	One-of-a-kind
SOLE	"Lemon" fish
SOLE	Seafood choice
SOLE	Oxford foundation?
SOLE	Matchless

SOLE	Foot bottom
SOLE	It's always underfoot
SOLE	Pivot point
SOLE	Dover fish dish
SOLE	.. proprietor