The answer to each clue includes the word SWEET.

-1. It feels good to get even
-2. Jackie Gleason saying
-3. Inconsequential expressions of affection
-4. Deal between employer and union
-5. '57 movie starring Burt Lancaster and Tony Curtis
-6. Strong craving for sugary food
-7. Asian dip
-8. Brief and to the point
-9. Bedtime tidings
-10. Egg-shaped terracotta wind instrument
-11. What is forbidden seems to be the best (st---- w-t--s a-- sw--t)
-12. False or overdone good cheer

2.) MMMMMmmmm, How sweet it is

6. sweet tooth

9. sweet dreams

5. Sweet Smell of Success

Sweet answers!

10. Ocarina aka sweet potato

8. short and sweet?

1- revenge is sweet

7. Sweet and Sour?

All correct!

3. sweet nothings :valentines:

Good one, Annette!

4. Sweetheart contract

Good solve, Fil!

12. sickeningly sweet

Nice try, Redz. I've added hints for the last two.

12. sweetness and light

Yes! I'd never thought of that in the negative before, but that's the definition.

#11 is a lesser-known saying:

st---- w-t--s a-- sw--t

11. Stolen waters are sweet

That's it, Koala!