What does the cryptic crossword clue "Ulcerative colitis cases, possible cause? (1,4)" mean?

The definition is "possible cause". The wordplay uses a container (one word inside another). Hidden in "ulcerativE COLItis cases, possible cause?" The answer is ECOLI.

Ulcerative colitis cases, possible cause? (1,4)

Guardian Cryptic #29158 | 25 Down | 2023-08-25 flower

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