How do I solve 14 down in Times Cryptic 29564?

Question

Accepted Answer

14 down reads "What’s used to ring hill fort above a river" (9 letters); the answer is CAMPANILE. 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.

What’s used to ring hill fort above a river (9)

14D — What’s used to ring hill fort above a river (9) — CAMPANILE