Related Clues:
- Ad-lib, musically
- Preserves, perhaps
- Sandwich filler, sometimes
- Driving headache
- Sticky situation?
- Commuter's woe
- What 20-, 37- and 53-Across may do
- Sandwich spread
- Play with friends
- Fruity toast topper
- Musical free-for-all
- Fruity toast topping
- Traffic trouble
- Improvise, in a way
- Freestyle music session