How do I solve 8 across in Daily Telegraph Cryptic 3372?

Question

Accepted Answer

8 across reads "Slump, a myth" (4 letters); the answer is SAGA. 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.

Slump, a myth (4)

8A — Slump, a myth (4) — SAGA