How do I solve 29 across in Daily Telegraph Cryptic 31234?

Question

Accepted Answer

29 across reads "Plastic bag from container ship" (3-5 letters); the answer is BINLINER. 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.

Plastic bag from container ship (3-5)

29A — Plastic bag from container ship (3-5) — BINLINER