How do I solve 21 down in Daily Telegraph Cryptic 31240?

Question

Accepted Answer

21 down reads "Raise army to defend garrisons essentially" (5 letters); the answer is HOIST. It's a container clue: one word goes inside another. Container indicators include 'in', 'around', 'holding', and 'embracing' — identify the outer word, then the inner piece that gets slotted into it. The full step-by-step breakdown is on this page.

Raise army to defend garrisons essentially (5)

21D — Raise army to defend garrisons essentially (5) — HOIST