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

1. The package will still get there, just not as quickly.
2. Where baseball players often get their start
3. e.g. as opposed to E.G.
4. Rough area often defined by railroad tracks
5. County law enforcement official
6. Like knockoffs
7. Popular board game
8. Like some inexpensive couches
9. Paper roses
10. Imitation fur coat
11. Try to be just like Mick Jagger
12. Exercise for law students
13. Court proceeding where the defendant is presumed guilty


Answers:

1. Second-class mail 
2. Minor leagues
3. Lowercase
4. Poor side of town
5. Undersheriff
6. Inferior quality
7. Trivial Pursuit
8. Imitation leather
9. Artificial flowers
10. Faux fur 
11. Wannabe rock star
12. Moot court
13. Mock trial

Credit: Chicago Tribune Crossword
Robert H. Wolfe - GETTING DOWN (#1-5)