7 Across - Key operator has a leading part in this work (5,8) ?i?n? C???????
4 Down - Letters of introduction (8) ???t???s
5 Down - Conventually screened (6) ???l??
12 Across - Quote about a wartime dictator about the origin of defeat (6)
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20 Across - Mink, maybye beneath an added frill (8) ????e?o?