What does the cryptic crossword clue "Cashback for item in all other across answers here (4)" mean?

The definition is "item in all other across answers here". The wordplay uses a reversal. LOOT (reversal="‘cash’-") = TOOL The answer is TOOL.

Cashback for item in all other across answers here (4)

Guardian Cryptic #29341 | 10 Across | 2024-03-27 flower