Just arrived, need some help to get started:
1a Noblemen use most of the brandy and wine (9)
8d One I get wrong, in enthusiasm for today's ethical climate? (9)
14d Money put about to sell one kind of tobacco (9)
28a The poor cabbie, finally caught by modified speed gun (4,2,3)
Gens de peu means "the poor". people.(definition)
Cabbie, finally is "E" - last letter
Gens de peu is an anagram of SPEED GUN + E, so "cabbie, finally" supplies the extra "E" to the partial anagram of "speed gun"