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1a
Spontaneous — unrehearsed (9)
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8a
Consume (3,2)
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9a
Replace what you've got with something better (5,2)
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10a
Gets less (8)
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11a
Detached, skimmed or final? (4)
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13a
Ancient quarter of many north African cities (6)
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14a
Unmoving (6)
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16a
Roman emperor after Claudius (4)
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17a
One lends a hand around the house (4,4)
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19a
1968 Simon & Garfunkel song (7)
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20a
Happen as a result (5)
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21a
Mocking (9)
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1d
Saucy (8)
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2d
Comic spiel (6)
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3d
Rounded and slightly elongated shape (4)
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4d
Form that a verb may take — steepen rents (anag) (7,5)
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5d
Without scruples (12)
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6d
The basics (12)
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7d
Confusion (12)
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12d
Unearthly (8)
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15d
Flooring found in ancient Roman villas (6)
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18d
Dishonest individual (4)