I give up on these last ones.
49a Energy for one turn that's quite a surprise (3 ) G - E
20a Dutch and American exiles might (6) - I - S - S
34a Perhaps the right stage for evasive action (4,4) - - - - S - E -
19d Second hand clothes girl's shown (7) U - H - R - -
28d Drink about three quarters, all the same one gets drunk (6) - A - - - S
All help appreciated. Thanks everyone.