1: God! Get real! There's no point getting upset (3)
2: Englishman opening a can to dine at home (3,2)
3: Make known one pound increase after high school (7)
4: Guess what the benighted marksman did? (4,2,3,4)
6: Inspects old radical for a moment (5, 6)
8: Awful din; ill effects were her own doing (4-9)
10: Excessively sentimental dunderhead in the river (5)
11: Incomplete raw data lies in largely unexplored regions (4,7)
13: Looking at a little monkey in glee (5)
14: Shoelace tip has baby bird losing its head (5)
16: Clean air makes Australia singular (5)
17: Choice bergamot subdues growler (7)
19: Hazardous emanation from river used by a crime boss (5)
21: Carries most of sea-bird back. (3)
23: Right, turn right to play with robot (3)