How do I solve 12 across in Daily Telegraph Cryptic 31247?

Question

Accepted Answer

12 across reads "Potential answer in questionnaire beats me" (4,4 letters); the answer is DONT KNOW. 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.

Potential answer in questionnaire beats me (4,4)

12A — Potential answer in questionnaire beats me (4,4) — DONT KNOW