What does the cryptic crossword clue "Composer angrily rails at heartless court (9)" mean?

The definition is "Composer". The wordplay uses an anagram. anagram of RAILS AT CT = SCARLATTI; definition: "Composer" The answer is SCARLATTI.

Composer angrily rails at heartless court (9)

Times Cryptic #28905 | 14 Across | 2024-05-01 flower