How do I solve 11 down in Daily Telegraph Cryptic 31260?

Question

Accepted Answer

11 down reads "Gamble on a second classification" (4 letters); the answer is BETA. 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.

Gamble on a second classification (4)

11D — Gamble on a second classification (4) — BETA