How do I solve 9 down in Daily Telegraph Cryptic 31243?

Question

Accepted Answer

9 down reads "Nit-picking of great consequence" (8 letters); the answer is CRITICAL. 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.

Nit-picking of great consequence (8)

9D — Nit-picking of great consequence (8) — CRITICAL