August Big Demon

Can't think of anything for 32a but the rest (I believe) are:

35a Trendy London district ??e?se? CHELSEA
23a Bookbinders' eggwhite adhesive ?l?ir GLAIR
31d MacBeth's roval victim D?n??? DUNCAN
145a seamless transition se?a? SEGUE (check that "a"!)
Good luck!

Hi jolm and Lmur

32a = AUTEUR. Remember this one, comes up regularly.

Agree with the rest of Lmur's submissions.

Good luck