Thank you both so much, especially Trevor for all your help,dont think I would have got superego,well not tonight anyway,Had hit a complete mental block.Just about finished crossword now
Yes E is definite, as it belongs to answer of earlier clue "concretE proof,Yes Cane looks good its the spelling thats bothering me ,should't it be spelled Cain??
I've never seen the Biblical Cain spelled any other way,i don;t think Cane can be right although i can't see an alternative.So maybe? It does sort of fit the clue.