PLANTED ANTONYMS
Credit: NY Times Crossword - Mar. 30, 1986
Ernst Theimer

[In this very clever puzzle, each clue requires two answers. The first answer is the expected one, while the second answer is another word that contains an antonym of a word hidden in the first answer.

Example:

Given the clue LIKE THE HEAVENLY GATES, the first answer would be PEARLY, and the second answer would be PLATE (PEARLY - PLATE)

1. NOT SO FAST
2. OBTAINED
3. ASSERTED WITHOUT PROOF
4. BURNISH ANEW  (abbreviations)
5.GUSH
6. DISTEND
7. FORESTALLED  (extra letter required)
8. SLY
9. LAPWING
10. FIRED
11. TEMPTRESS

Answers:

1. SLOWER - SUPPER
2. GOT - COMET
3. ALLEGED - ALARMED
4. REPOLISH - DEMOLISH
5. SPOUT - SPIN
6. SWELL - SILL
7. PREVENTED - PRODDED
8. TRICKY - TREATY
9. PLOVER - PLUNDER
10. SHOT - SCOLD
11. SIREN - DAMN