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1a
Winning all four major tennis championships in the same calendar year (5,4)
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8a
Former PM (5)
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9a
Irish river — girl's name (7)
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10a
Similarity — portrait (8)
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11a
Speech defect (4)
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13a
Mouth organ? (6)
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14a
Vocalist (6)
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16a
Oxfordshire (abbr) (4)
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17a
Italian bread (8)
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19a
Slanting letters (7)
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20a
Spurious (5)
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21a
Wading bird — no nutters (anag) (9)
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1d
Popular pot plant (8)
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2d
Aid (6)
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3d
Twofold (4)
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4d
Platform for disembarking (7,5)
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5d
District of Paris on the left bank (12)
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6d
Anti-slavery campaigner (12)
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7d
Highly elated (7,2,3)
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12d
African country (8)
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15d
Debacle (6)
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18d
Bad shot (that's as good as a mile?) (4)
