What does the cryptic crossword clue "A top raft hothead crashed without good reason (2,3,4,2,1,3)" mean?

The wordplay uses an anagram. anagram of A + TOP + RAFT + HOTHEAD = ATTHEDROPOFAHAT The answer is ATTHEDROPOFAHAT.

A top raft hothead crashed without good reason (2,3,4,2,1,3)

Daily Mail Cryptic #17126 | 2 Down | 2023-06-23 flower