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6a. ???? (4) Plodding south followed bt beastly noise.
7d.????T?????/D?A?A (10,5) Allowed to be on stage in it.
20a. QU????? (7) Discharge, Equus troubled with it.
23d. T?O? (4) Excessively long implement.

23 Tool , implement (Too+L/ong)
20 20 Quietus, I think.

20 QUIETUS
23 TOO L

S LOW?

6 Slow, plodding - S/south+Low/beastly noise.

Thank you malone and chrise for replies.

7 Legitimate Drama.(it's in my Chambers dictionary)

PS. Happy to help.