How do I solve 13 across in Times Cryptic 29534?

Question

Accepted Answer

13 across reads "Huge letters used to spell “Dad”, being popular in China" (5,5 letters); the answer is GIANTPANDA. It's a charade: the answer breaks into parts in clue order, each part clued by a word or short phrase. No indicators needed; watch for standard abbreviations (RA = artist, US = American, IN = at home) and short synonyms. The full step-by-step breakdown is on this page.

Huge letters used to spell “Dad”, being popular in China (5,5)

13A — Huge letters used to spell “Dad”, being popular in China (5,5) — GIANTPANDA