How do I solve 2 down in Times Cryptic 29540?

Question

Accepted Answer

2 down reads "Dip very short tongue?" (7 letters); the answer is IMMERSE. 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.

Dip very short tongue? (7)

2D — Dip very short tongue? (7) — IMMERSE