11 ac: Martial art mostly random hit and miss (6) J?D??? 13 ac: you may underperform, portrayed as heartless operatic heroine (3,3) Is it Yum Yum? 6 dn: One seeing future is reflecting on past line (5) S???L
11a: JUDITH JUD(O) with random HI|T6d: struggling with this one but could be SIBYL (IS reflecting, past=BY and L=Line) A bit far-fetched but can't think of anything els