Actress Cusack (4)
I believe the answer is:
joan
'actress cusack' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for joan that I've seen before include ". . . . of Arc, French warrior saint" , "'Saint - - ' (Shaw play)" , "First name of the Maid of Orleans" , "- Plowright, actress" , "Orleans girl" .)