Help appreciated with these...
3d. Pieces, quietly forgotten, including previous symphonies and sonnets, say (3,5) - ART FORMS (Symphonies and sonnets, say)
I thought this was 'Pieces' = (p)ARTS (quietly forgotten), and 'Previous' = FORM(er), but I don't see any instruction to get rid of the ER in 'Former'?
37d. Fish head added to Greek dish oddly overlooked (3,7) - RED SNAPPER (Fish)
If 'Head' = PER, and gReEk DiSh (Oddly overlooked), then I'm still left with NAP unparsed?
18d. Solid cloud seen at first over Island (8) - CONCRETE (Solid)
This looks like C(loud) + ON + CRETE (Island) but where does the 'ON' come from?
42a. Backing what stops awkward situation? - ?E?I?D There are only about 15 words that fit this pattern and I can't make a case for any of them!