How do I solve 24 across in Express Cryptic 20260521?

Question

Accepted Answer

24 across reads "Proficient fighter for contentious building site" (9 letters); the answer is GREENBELT. 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.

Proficient fighter for contentious building site (9)

24A — Proficient fighter for contentious building site (9) — GREENBELT