Three left - remnants of cold not helping -
26A Mix-up over top of herd in reserve (8)
A?S?I?H?
39A Bell, perhaps, in Isle of Wight resort has lost note (8)
?N?E?T?R
&
40A Small freshwater fish making for steep bank (5)
S?A?P This may be SWAMP but can't really see why, nor is my "Big Boys Book of Fish" very helpful.
The usual caveat about the accuracy of all, some or any of these letters applies.
Taking muzzy head to bed so all acknowledgments of gratitude will follow tomorrow