What does the cryptic crossword clue "Help to explain cost halting works (4,5,2)" mean?

The wordplay uses an anagram. anagram of COST + HALTING = CASTLIGHTON The answer is CASTLIGHTON.

Help to explain cost halting works (4,5,2)

Daily Mail Cryptic #17220 | 1 Across | 2023-11-02 flower