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

1. Very stylish
2. Feebleness of advanced years
3. Author of The Thin Man
4. Play by Samuel Beckett
5. Short, amusing story
6. Reindeer Number One
7. Opera by Puccini
8. African-themed garment
9. Store featuring men's apparel
10. Classic fabric pattern
11. Remedy for poison
12. Rubbish!

Answers:

1. DASHing
2. DOTage
3. DASHiell Hammett
4. Waiting for GoDOT
5. anecDOTe
6. DASHer
7. TuranDOT 
8. DASHiki
9. haberDASHery
10. polkaDOT
11. antiDOTe
12. balderDASH

Credit: LA Time Crossword
Sylvia Bursztyn and Barry Tunick
ESROM CODE  (adapted)