Thanks for saying exactly what I was thinking, MadWoman, this is the sort of crossword that makes me hate crosswords. I also couldn't get 23d (Mrs Strangely says cricket answers are the reason she doesn't do crosswords and she has a point - how many people know what extra cover is?).
37a Great Lakes' fish company stores can be found west of Chicago (5)
C?S?O.
43a Piece coming through from an overanxious Russian oligarch (7)
Looks like Romanov.
47d Period certainly finishing fine and free (6)
?R?D?Y
Friday?
24a Old man breaking lock and turning over residence (10)
Trespasser? Pa (old man) in tress (breaking lock), but after that I don't know what's happening, or how the definition works.