Answer: singletons

AnswerCrossword Clue
SINGLETONSCertain bridge holdings
SINGLETONSOnly children
singletonsA set that contains exactly one element
singletonsA child or animal born singly, rather than one of a multiple birth
singletonsSINGLETON, a playing card that is the only one of its suit in a player's hand
singletonsA single person or thing of the kind under consideration
singletons(in card games, esp. bridge) A card that is the only one of its suit in a hand