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1a
Cutting — snide (9)
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8a
River estuary between Argentina and Uruguay (5)
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9a
Overall chief (7)
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10a
Inca raid (anag) — it's a combination of industrial gas emissions with water in the atmosphere (4,4)
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11a
Touch with the lips (4)
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13a
Sea journey (6)
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14a
Jinx (6)
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16a
Stolen goods (4)
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17a
One from the island where Napoleon Bonaparte was born (8)
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19a
Marked with blotches (7)
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20a
Aquatic mammal that lives in a holt (5)
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21a
Requiring great exertion (9)
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1d
Historically, the cheapest accommodation on a 13 (8)
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2d
Countrified (6)
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3d
Mountains of south-central Europe (4)
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4d
Chicago (3,5,4)
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5d
Type of running race (5,7)
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6d
Convey a great deal without using words (5,7)
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7d
GP (6,6)
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12d
North African dish of steamed semolina with a stew (8)
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15d
Family car manufactured by Ford since 1993 (6)
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18d
'A man, a ___ , a canal: Panama!' (4)