Just have four to go; would welcome hints please:
35 deform a shell (6) (I can't make the clues given already fit this - perhaps I'm being very stupid)
38 Big Guys with some tobacco from the depths (5,5). I have a possibility for the second word but can't find anything to go with it.
97 River horse taking drug (5) Would like this to be the usual short word for a river horse but can't find it as a drug.
98 Refreshed, successor to Mohammed takes to the road (8) Have tried combinations of anagram of one of the successors of the Prophet + st, rd, but haven't got anywhere.