How do I solve 28 across in Daily Telegraph Cryptic 31246?

Question

Accepted Answer

28 across reads "Desmond and Helen's city break" (7 letters); the answer is DESTROY. It's a charade: the answer breaks into parts in clue order, each part clued by a word or short phrase. No indicators needed; watch for standard abbreviations (RA = artist, US = American, IN = at home) and short synonyms. The full step-by-step breakdown is on this page.

Desmond and Helen's city break (7)

28A — Desmond and Helen's city break (7) — DESTROY