How do I solve 1 across in Express Cryptic 20260522?

Question

Accepted Answer

1 across reads "Prisoner's robbery is a plot" (10 letters); the answer is CONSPIRACY. 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.

Prisoner's robbery is a plot (10)

1A — Prisoner's robbery is a plot (10) — CONSPIRACY