Answer:

TANLINE

Answer	Crossword Clue
TANLINE	Result of incomplete coverage?
TANLINE	Sign of a sunbather
TANLINE	Basker's annoyance

TANLINE	Bikini wearer's mark
TANLINE	Sunbathing evidence
TANLINE	Beach acquisition
TANLINE	Proof of basking
TANLINE	Sign of browning
TANLINE	Mark caused by a bikini
TANLINE	Nude sunbather's lack
TANLINE	It may fade in winter

TANLINE	Nudist's lack
TANLINE	Separator of light and dark
TANLINE	It may be hidden under a shirt
TANLINE	Where brown and white meet
TANLINE	A lifeguard's whistle might create one
TANLINE	Something not seen on a nudist, maybe
TANLINE	Evidence of sunbathing
TANLINE	Sunbather's demarcation

TANLINE	Evidence of sunning
TANLINE	Mark on a bikini wearer
TANLINE	Beach bunny concern
TANLINE	Bikini wearer's giveaway
TANLINE	Dark-light separation
TANLINE	Strip at the beach?
TANLINE	What sunning in a swimsuit leaves