What does the cryptic crossword clue "Film heat for broadcast at interval (4,4)" mean?

The definition is "interval". The wordplay uses an anagram. anagram of FILM + HEAT = HALFTIME; definition: "interval" The answer is HALFTIME.

Film heat for broadcast at interval (4,4)

Daily Mail Cryptic #17184 | 1 Across | 2023-09-13 flower