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1a
Capital of North Rhine-Westphalia (10)
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7a
Cage holding poultry (7)
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8a
Place of calm in troubled times (5)
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10a
Spanish currency (4)
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11a
Parrot native to Australia and Indonesia (8)
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13a
Quell (6)
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15a
Make a piercing sound (6)
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17a
Sign of the zodiac (8)
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18a
Mop (4)
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21a
Danish currency (5)
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22a
Bewitching (7)
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23a
Social club for American male undergraduates (10)
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1d
Organ giver? (5)
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2d
Black chimney powder (4)
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3d
Hire (6)
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4d
One method of scoring three points at rugby union (4,4)
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5d
Badge with a ribbon (7)
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6d
PS He has Ken (anag) — rope-shortening knot (10)
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9d
Tracked vehicle for winter travel? (10)
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12d
Nourishing substance (8)
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14d
Bedroom fit for a lady (7)
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16d
Warm season (6)
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19d
Bonkers (5)
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20d
Trademarked hybrid citrus fruit (4)