What does the cryptic crossword clue "With this I’m making a blunder? (6)" mean?

The wordplay uses an anagram. anagram of THISIM ("this I'm") [anagram: "blunder?"] = MISHIT The answer is MISHIT.

With this I’m making a blunder? (6)

Guardian Cryptic #29664 | 22 Down | 2025-04-09 flower