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1a
Someone willing to trade favours for mutual advantage? (13)
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8a
Open pastry case (4)
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9a
Somewhat unreasonable or OTT (1,3,4)
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10a
Sleuth (10)
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12a
Source of danger (6)
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14a
Disturbance (6)
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15a
Urchin (10)
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19a
Unpredictable factor (4,4)
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20a
Skating jump with a turn (4)
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21a
Another item? (9,4)
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2d
Signal that it's safe to come out (3,5)
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3d
Japanese martial art using split bamboo swords (5)
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4d
Was incompatible (7)
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5d
Bye (5)
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6d
Funny (7)
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7d
Per person (4)
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11d
Commercial activity (8)
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13d
Curtail (7)
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14d
Islam's holiest month (7)
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16d
Grind (one's teeth) (5)
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17d
Burner — passion (5)
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18d
Cylindrical storage tower (4)