How do I solve 15 across in Daily Telegraph Cryptic 31254?

Question

Accepted Answer

15 across reads "Number for Spice Girl making a comeback? That's fine!" (2,7 letters); the answer is NO PROBLEM. 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.

Number for Spice Girl making a comeback? That's fine! (2,7)

15A — Number for Spice Girl making a comeback? That's fine! (2,7) — NO PROBLEM