What does the cryptic crossword clue "His reaction after masque dances? ‘Likely to feel sick’ (9)" mean?

The definition is "sick'". The wordplay uses an anagram. anagram of HIS + MASQUE = SQUEAMISH; definition: "sick'" The answer is SQUEAMISH.

His reaction after masque dances? ‘Likely to feel sick’ (9)

Guardian Cryptic #29408 | 1 Across | 2024-06-13 flower