Hi Pauly,
9a - Single letter "Picaroon" (the setter) inside 5 letter "craving lucre" - definition is "forgivable"
14d - If you look at the words "Marxism" and "Leninism" you'll see they both contain a ?????? reversed - definition is "old issue"
6d - 2 letter "during" + 4 letter "school" + 5 letter "outcast" reversed/turned up + 4 letter "advanced" - definition is "means of deterring pests".