How do I solve 12 across in Daily Telegraph Cryptic 31239?

Question

Accepted Answer

12 across reads "Husband leaving from Cork perhaps – that's a bloomer" (4 letters); the answer is IRIS. 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.

Husband leaving from Cork perhaps – that's a bloomer (4)

12A — Husband leaving from Cork perhaps – that's a bloomer (4) — IRIS