How do I solve 1 across in Daily Telegraph Cryptic 3373?

Question

Accepted Answer

1 across reads "Awful, as could be proclamation after gagging order?" (11 letters); the answer is UNSPEAKABLE. It's a double-definition clue: two separate definitions of the same word sit side by side. No wordplay split and no indicators — both halves of the clue define the answer. The full step-by-step breakdown is on this page.

Awful, as could be proclamation after gagging order? (11)

1A — Awful, as could be proclamation after gagging order? (11) — UNSPEAKABLE