7d All-out action as military leader heads assault (7,6)
8d Great character-Joan,for instance,as a poet (9.4)
11a A scheme to root out corruption (6)
26a She daren't change into a new beret(11)
I think Bernadette is right being an anagram of "daren't" and "beret" but there is an R left over. Someone else has spelt it Bernardette. So perhaps this is another way to spell it. Thanks for all your answers.