After a week away, there is a corner I can't sort out, as ever. This week it is top left. I think 1a is long term, but I cant see why.
But I think help with 4d would be of most use
4d Unpack unusual electrical elements, retaining cases for instruments (8).
I ave (not much) ---L--S.
I cant sor this clue at all. As ever, help gratefully accepted. Thanks you.