How do I solve 4 down in Daily Telegraph Cryptic 3370?

Question

Accepted Answer

4 down reads "Runner, flier and hunter" (7 letters); the answer is HARRIER. It's a double-definition clue: two separate definitions of the same word sit side by side. No wordplay split and no indicators — both halves of the clue define the answer. The full step-by-step breakdown is on this page.

Runner, flier and hunter (7)

4D — Runner, flier and hunter (7) — HARRIER