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1a
Stubbornly persistent (or boarish?) (9)
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8a
Sudden involuntary movement (5)
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9a
Unfortunate events (7)
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10a
A white one's useless (and expensive) (8)
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11a
Gentle creature (4)
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13a
Headgear (informal) (6)
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14a
Diverse (6)
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16a
Weaponry (4)
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17a
Winter sports shoe (3,5)
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19a
Direct phone for use in emergencies (7)
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20a
Keepsake (5)
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21a
Nimble — energetic (9)
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1d
Brochure (8)
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2d
Playing on computers or other electronic devices (6)
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3d
A walk in the park? (4)
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4d
In an impressive manner (12)
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5d
Insubordinate behaviour (12)
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6d
1980 David Bowie song (5,2,5)
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7d
Consumer warning (6,6)
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12d
One who does not emulate the Good Samaritan? (6-2)
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15d
Distinctive way of speaking (6)
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18d
Annexe to a building (4)