How do I solve 18 down in Daily Telegraph Cryptic 31236?

Question

Accepted Answer

18 down reads "Cursed bishop went on for a long time" (7 letters); the answer is BLASTED. 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.

Cursed bishop went on for a long time (7)

18D — Cursed bishop went on for a long time (7) — BLASTED