The answers to the clues below will have something in common:

1. Performer in a cage, at times
2. Famed cellist
3. OK
4. French fashion designer
5. "Tea for Two" musical
6. Dog from Kansas
7. Symbol of extinction

Answers:

1. GO-GO dancer
2. YO-YO Ma
3. SO-SO
4. COCO Chanel
5. NO NO Nanette
6. TOTO
7. DODO bird 

Credit: NY Times Crossword
Sarah Keller