What does the cryptic crossword clue "Layman's error too misrepresented scientific post (10,5)" mean?

The wordplay uses an anagram. anagram of LAYMAN'S + ERROR + TOO = ASTRONOMERROYAL The answer is ASTRONOMERROYAL.

Layman's error too misrepresented scientific post (10,5)

Daily Mail Cryptic #17424 | 1 Down | 2024-08-15 flower