6a. Boy barber is to hum and haw (6) --AV-R.
27a. Sepia fills this flush waste mostly quietly drained (6) IN--A-.
29a. Special shed for Trudeau's fish (5) S--L-.
31a. Language of cheesy stuff, but see, uniform (4) --D-.
7d. Skip first half of promise to check the plates (6) -OP-LE.
20d. A loser possibly out of energy, an - (7) A-----T.
24d. Real pretence for us in routine (6) -----R.