How do I solve 1 down in Times Cryptic 29545?

Question

Accepted Answer

1 down reads "Musk nearly leaving wine for trainee" (5 letters); the answer is CADET. It's a deletion clue: start with a word the clue points to, then drop one or more letters. Indicators include 'endlessly' (lose the last letter), 'beheaded' (lose the first), or 'heartlessly' (lose the middle). The full step-by-step breakdown is on this page.

Musk nearly leaving wine for trainee (5)

1D — Musk nearly leaving wine for trainee (5) — CADET