How do I solve 7 down in Daily Telegraph Cryptic 31265?

Question

Accepted Answer

7 down reads "In cahoots, what some do at lost property office?" (4,2,5 letters); the answer is HAND IN GLOVE. It's a double-definition clue: two separate definitions of the same word sit side by side. No wordplay split and no indicators — both halves of the clue define the answer. The full step-by-step breakdown is on this page.

In cahoots, what some do at lost property office? (4,2,5)

7D — In cahoots, what some do at lost property office? (4,2,5) — HAND IN GLOVE