What does the cryptic crossword clue "Plant of the daisy family we grade mistakenly (7)" mean?

The definition is "Plant". The wordplay uses an anagram. anagram of WE + GRADE = RAGWEED; definition: "Plant" The answer is RAGWEED.

Plant of the daisy family we grade mistakenly (7)

Daily Mail Cryptic #17121 | 1 Down | 2023-06-16 flower