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These have all been created by a variety of well-known constructors. There may be one or two that we might question, but they're still fun. Please explain all answers.
-1. Jazz singer's suffering when the last couple leave (5)
-2. Teach guys to tip in restaurants (6)
-3. Element of demon's terrifyingly grotesque character (7)
-4. Buffalo is close to the nearest star, reportedly (5)
-5. Mars contains an "r" - Koppel checked (8)
-6. Rev. Spooner's money remains for Robin (9)
-7. Goes to bed in fatigues again? (7)
-8. Artificial ingredients in burgers at zoo (6)
-9. Overact a teensy bit after error (5)
-10. Large bows for conifers (7)
-11. Fire a store employee? (7)
-12. Addresses in Southern mountains (6)