5th down I have IDIO(FA) which makes sense cryptically, but the answer is a bit obscure.
1st down I have A(SCENT)
The 3/4 I'm stuck on are:
5th across, An insect has broken in dazzling for a moment, INSTANCE is a simple ana. of "an insect" but can't see how "dazzling" fits in?
6th across, Test to recognise legendary label
3rd down, Get to support up front
8th down, American bird's black dress