How do I solve 27 across in Daily Telegraph Cryptic 31239?

Question

Accepted Answer

27 across reads "These people rioting occasionally, uproar and sirens?" (9 letters); the answer is PRISONERS. 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.

These people rioting occasionally, uproar and sirens? (9)

27A — These people rioting occasionally, uproar and sirens? (9) — PRISONERS