What does the cryptic crossword clue "Stan too modified a description of marmalade? (2,5)" mean?

The wordplay uses an anagram. anagram of STAN + TOO = ONTOAST The answer is ONTOAST.

Stan too modified a description of marmalade? (2,5)

Daily Mail Cryptic #17240 | 9 Across | 2023-11-30 flower