15d. Man of steel bitter about disorder after uprising(8) (Answer = Bessemer?), but how does "bitter" equate to "be"? This is (I think) ... BEER (bitter) containing SSEM (mess=disorder backwards).
40d. Item on reservation sounds a bit soft to fill pastry case(5,4) (peace, pipe)?? I think ... PEACE (sounds like piece=a bit) and PIPE (a kitchen tool used to 'pipe' stuff into pies, icing onto cakes etc.., not that I really know anything about cooking).