26dn. Rash, more than anything, is connected with temperature.(8)H?S?I?S? think it is hastiest but can not tie this to clue other than rash. 33dn. Slips a black coat on -the wrong way(6) ?R?A?A think...
6dn. Composite chapter on fashionable period with elevated manner.(9)C?N?R?R??
19ac. Area covered by shellfish, mostly uninteresting seafood (8)?A???A?I...
19dn. Dull being second for many years on end, extraordinarily(7)?N?D?NE I can only think of anodyne which might dull pain but I don't really see the cryptic other than a part anagram(on end) but...
16ac. In a classically singular country. (6) I?D?U? I can only think of indium but this is a metal so I am not sure how this fits the clue or if it's right any help and an explanation please.
10ac. Runs back having dash in German region.(9) ??I?E?A?D could be rhineland but can't see cryptic. 8dn. Escape monster blowing top in fight.(5,3) ???A?,O?T could be break out but again can't see...
23ac. Rascal with line right out of place.(8) I???O?E?D
21dn. Fowl getting better and functioning.(5)C???N Could be capon but can not see the cap bit....
15ac. Twelve cipher books I'd found in one, with amendments(8) N?O?T?D? I can only think of noontide but other than twelve for noon I can not make the clue out.
18dn. Dotty old actor took the lead after following shaky start(8 )S?E??LET
20dn Wearing clothes makes you hot when sleeping it's maintained(7)?A?ITER...
14ac. Saying nothing, dropping hot fruit juice.(4) ?T?M. I have stum as the answer, slang for keeping quiet an also a grape juice but I can not see where hot comes into it.