1: Coming unglued at paper battlement (7)
2: Like a high ranking diplomat's awful ambrosia salad (13)
3: Mr. Upton dressed, one suit being just like any other? (2-5)
4: Tavern drink for the auditor, one with access to confidential information (7)
5: Lawman inside fires back, hits female (7)
6: Prepares this way, dearies (7)
7: Bear with a blemish following us around (7)
10: Does not see the advertisement because it is in the wrong section. (13)
14: Employs as token members (5,2)
16: Outrageous trio of Italians bursting in on divorcee and me (7)
17: Rear oat variety as a way to break up the soil (7)
18: Volume projected upwards in good acting (7)
19: Talk about Spanish river vehicle (7)
20: Records that could be hits (7)