How do I solve 1 across in Times Cryptic 29545?

Question

Accepted Answer

1 across reads "Humbled Conservative used speed" (9 letters); the answer is CHASTENED. 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.

Humbled Conservative used speed (9)

1A — Humbled Conservative used speed (9) — CHASTENED