1: Fill-in professional almost rewrote the column (5)
3: Coats need woven yarns (9)
4: Feel sick from crack? (3)
5: I am reported to leer (3)
9: Pitcher, lunatic, not married (5)
10: Farewell from union leader after getting something straight (5)
11: Perform part of play (3)
12: Sound of river crossing (3)