What does the cryptic crossword clue "Charity's post is designed for a scientific expert (14)" mean?

The wordplay uses an anagram. anagram of CHARITY'S + POST + IS = ASTROPHYSICIST The answer is ASTROPHYSICIST.

Charity's post is designed for a scientific expert (14)

Daily Mail Cryptic #17003 | 26 Across | 2023-01-03 flower