How do I solve 13 down in Times Cryptic 29550?

Question

Accepted Answer

13 down reads "Dull radio presenter on outside broadcast where promotion will be missed" (4-3,3 letters); the answer is DEAD-END JOB. 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.

Dull radio presenter on outside broadcast where promotion will be missed (4-3,3)

13D — Dull radio presenter on outside broadcast where promotion will be missed (4-3,3) — DEAD-END JOB