Answer: onetime

AnswerCrossword Clue
ONETIME

Singular event

ONETIME

Unique, sort of

ONETIME

Quondam

ONETIME
Former
ONETIME
Erstwhile
ONETIMEUnique
ONETIMEPast
ONETIMEPrevious
ONETIMEWithout repetition
ONETIMENot to be repeated
ONETIMEQuondam.
ONETIMEQuondam; former.
ONETIMEFormer.
ONETIMEAt some past date.
ONETIMEFormerly.
ONETIMEWord for a has-been
ONETIMEEx-