11 Across, Be coming in at six, Extremely held back (5) E?I?T (EXIST?)
23 Across, Sea captain died, getting profligate (5) D????
26 Across, Keep up with contacts? Fool corners a couple (7) N?T?O??
27 Across, With lumps drifting around and around lake (7) N?D???? (NODULES?)