16 Down, Upholds crimes involving American soldiers? (8) S?S?A?N?
18 Across, Kitchen utensil,brass,not entirely long (8) S?U?E???
20 Down, Caller's dismissed just after heated period (6) S?M?E?
22 Down,US author not enough for single academic (6) L?N?O?
Compiler - PHI
Many Thanks