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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. Units for measuring heat that's left inside vehicle (4)
-2. Beset by opposing forces, Western ship ordered a start to warfare (7)
-3. "This is fun!" we said (4)
-4. Golfing obstacle set right in driving area (4)
-5. Smug approach drama cast discussed (10)
-6. Cheese maker's closing pipe (5)
-7. 100 google matches for "receipts or vouchers" (5)
-8. Amusing and marginally kooky, like bluesy jazz (5)
-9. Hot Eisenhower dollar increased sharply (5)
-10. New York City club's second in bagpipe-playing (3,5)
-11. Marx's merry escapade, switching sides (4)
-12. Kournikova is partly Russian, naturally (4)