How do I solve 2 down in Times Cryptic 29556?

Question

Accepted Answer

2 down reads "Puzzling pieces of square brown mass" (7 letters); the answer is TANGRAM. 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.

Puzzling pieces of square brown mass (7)

2D — Puzzling pieces of square brown mass (7) — TANGRAM