IDIOMAZE
Credit: GAMES Magazine
August, 2005
Robert Leighton (#1-15)

Each word or phrase below can be re-phrased as an idiomatic prepositional phrase such as "under the wire" or "above the law." For example, given the clue Past middle age, the answer could be Over the hill.

1. Too far
2. Where to read what's implied
3. How radio shows are broadcast
4. Constantly - day and night
5. Irrelevant
6. Nonprescription
7. On a tight deadline
8. Everywhere - universal
9. Strictly according to procedure
10. Excessively flamboyant
11. Hidden - illegal, as payments
12. Where the experienced have been
13. Feeling ill
14. Almost there (with "It's just")
15. Unfair - dirty, as in boxing
16. Exactly right
17. Unexpected, inappropriate, bizarre
18. In a tight spot, in trouble
19. New York to London route
20. Unconventional

Answers:

1. Over the line
2. Between the lines
3. Over the air
4. Around the clock 
5. Beside the point
6. Over the counter
7. Under the gun
8. Around the world
9. By the book
10. Over the top
11. Under the table
12. Around the block
13. Under the weather
14. Around the bend
15. Below the belt
16. On the button
17. Off the wall
18. Behind the eight-ball 
19. Across the pond
20. Against the grain