How do I solve 4 down in Times Cryptic 29562?

Question

Accepted Answer

4 down reads "Guard at gate failing to open gate, perhaps" (5 letters); the answer is ENTRY. 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.

Guard at gate failing to open gate, perhaps (5)

4D — Guard at gate failing to open gate, perhaps (5) — ENTRY