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1a
Woody shrub with large, sometimes globe-shaped, flower heads (9)
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8a
How letter writers often start to sign off (5)
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9a
Vegetable product used in food manufacturing, beauty products, and as biofuel. (4,3)
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10a
Hint (8)
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11a
Mobile phone communication (4)
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13a
Places one often visits (6)
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14a
Strong drink (6)
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16a
Geekish sort (4)
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17a
Weakness (4,4)
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19a
Refuge (7)
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20a
Proportion (5)
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21a
One has a serious problem with 14 (9)
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1d
Do this and you're lost! (8)
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2d
Rely (upon) (6)
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3d
In a competent manner (4)
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4d
Punch and Judy, say (5,7)
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5d
Make a mountain out of a molehill, for instance — I tear into all (anag) (12)
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6d
Obsessive anxiety about one's heath (12)
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7d
Involving complex rules and processes (12)
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12d
Significant (8)
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15d
When cold, people often sleep in such a position (6)
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18d
Affirmative (informal) (4)