I am slowly going mad! I've got all the extra letters and all the unclued words, but I still have 3 clues I just can't make any sense of - and I've been trying for the last 3 hours!!
3d Upset and uneasy about being naked - SAE? with D extra
12a Nausea caused by fish turning stomach - ?IGUT with S extra
17a Sheet metal roller - ?LATE with N extra