Lovatts Colossus 158 Cryptic

Hi fellow puzzlers
I am really stuck on this puzzle and running out of time.

12a. Trapped by peculiar percussion instrument. (5,4) =. S?A?EDRUM
23a. Blue ribbon awarded to graduate with outwardly tough exterior =. (6)
R?BAND
31a. Stressed when describing a letter with additional information (8) =. (I have) AFFECTED
36a. Former lover bringing back paintings (5) =. EXP??
48a. Shelf you have to rebuild is a real pest. ((8) =. .????TF?Y
54a. Earl upset about very loud lottery (6). =. ?????E
72a. Take off tie? (7). = ????T?H

25d. Executive position in school of Phrenology
Loire castle makes some mocha. Tea? Unlikely! (7). = F??TE?? (This is crossed with AFFECTED as in 31a
49d. You might strike if there is security before the big game (6,5) =
????T?M?T??
55d. This girl is a butterfly catcher I'm told (7). ??N?T?S

Cheers Smithy