2: Amoebas inside the sink! (5)
3: Neat plastic hash pipes (9)
4: Tweak with wrong end of a pin (3)
5: University with unconventional stance about unconventional person (7)
6: 21-across A lot of fuss about a trifling matter, according to Shakespeare? (4,3,5,7)
9: Do as I say in short retreat (5)