What does the cryptic crossword clue "Film about boring mathematical equation (4)" mean?

The definition is "Film". The wordplay uses a container (one word inside another). C (synonym="about") in SUM (synonym="mathematical equation") = SCUM; definition: "Film" The answer is SCUM.

Film about boring mathematical equation (4)

Guardian Cryptic #29407 | 27 Down | 2024-06-12 flower

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