ACROSS
1 Calls up (10)
7 Large west African country (7)
8 Speed (mus) (5)
10 Assignment (4)
11 Resounding (8)
13 Din (6)
15 Cerebral (6)
17 False (8)
18 Large casks (4)
21 Very fast (5)
22 Exact (7)
23 Syllabus (10)
DOWN
1 Confines (5)
2 Standard (4)
3 Moves on hands and knees (6)
4 Meant (8)
5 Storm (7)
6 Investment funds (4,6)
9 Was stronger than (10)
12 Intercedes (8)
14 A messenger (7)
16 Agile (6)
19 Wrong (5)
20 Enthusiasm (4)