How do I solve 8 down in Daily Telegraph Cryptic 3374?

Question

Accepted Answer

8 down reads "Cain, he?" (5,6 letters); the answer is THIRD PERSON. 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.

Cain, he? (5,6)

8D — Cain, he? (5,6) — THIRD PERSON