What does the cryptic crossword clue "Feeling sick foolishly ate sundae (9)" mean?

The definition is "Feeling sick". The wordplay uses an anagram. anagram of ATE SUNDAE = NAUSEATED The answer is NAUSEATED.

Feeling sick foolishly ate sundae (9)

Independent Cryptic #12157 | 15 Down | 2025-09-25 flower