How do I solve 19 across in Times Cryptic 5218?

Question

Accepted Answer

19 across reads "On which line’s dropped by Pole with spade?" (8 letters); the answer is POSTCARD. 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.

On which line’s dropped by Pole with spade? (8)

19A — On which line’s dropped by Pole with spade? (8) — POSTCARD