1: Convertible has odd bar in instrument panel (9)
8: Abstract art is just one step.(5)
9: Ice cream containers to Georgia in wagon (9)
11: Defusing timer incorrectly can lead to this! (13)
13: Measure of heat in the empty room (5)
14: Former name for joint audition (3)
15: A donated century plant, e.g. (5)
17: Caught carrying oregano's essence in inhalers (5)
18: Greek characters suggest dawn (3)
20: Brand of cat food containing bird's head and feet (5)
21: 'Ransom'? Lame. Run 'Rocky I', 'II', 'III', etc. (5,8)
23: Infamous Ms. Spelling: 'Nothing's within reason!' (9)
25: One competes for prestigious universities (5)
26: Helga excels coming back with a two under par (5)
27: Tiger seen roaming National Park (9)