What does the cryptic crossword clue "Found holes in up-ended can: opened with sharp tool (9)" mean?

The wordplay uses a reversal. TIN (reversal="can") + PICKED (synonym="opened with a sharp tool – e.g. a lock") = NITPICKED The answer is NITPICKED.

Found holes in up-ended can: opened with sharp tool (9)

Guardian Cryptic #29322 | 14 Down | 2024-03-05 flower