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

1. Kind of board or breaker
2. "The Bronx is up and the ............. 's down."
3. Bench press, squat, and clean and jerk
4.  Plastic money
5. It's what's happening now
6. Asset in baseball
7. Ceases support
8. Steam engine pioneer
9. Timekeeper, in a way
10. Cars and relationships need them

Answers:

1. CIRCUIT
2. BATTERY
3. POWER liftiing
4. CHARGE cards 
5. CURRENT event
6. SWITCH-hitter
7. Pulls the PLUG
8. James WATT
9. CONDUCTOR
10. SPARKS

Credit: LA Times Crossword
Sylvia Burstzyn and Barry Tunick
HEY, CONDUCTOR!    (adapted)