1a Swimmer = SCUP around A = diver. The U is moved
6d Stolid = 2 letters usually before "faced". Vital = important / opener / island. I think K is moved. not sure
27a Anagram of REACHED. Famous gorges.
4d Material = ACTUAL + RI + A. I think C moves. Not sure
11a is as you suggest. Remain = ARE.
I have the main course and the dessert in the perimeter, but I'm having difficulties with
10a Queen goes in to examine covering for head. I have E in the perimeter and ?A??U in the grid
3d I was doubtful about quiet Virginias tops. I have A??S in the grid
Because of the nature of most of the perimeter, I've assumed that the top row includes the word COOK. Help with the above would be welcomed.