What does the cryptic crossword clue "Former prime minister's on board with cases (7)" mean?

The definition is "cases". The wordplay uses a container (one word inside another). HEATH (synonym="Ted, ‘former prime minister’") in SS (synonym="‘on board’") = SHEATHS; definition: "cases" The answer is SHEATHS.

Former prime minister's on board with cases (7)

Guardian Cryptic #28989 | 27 Across | 2023-02-09 flower

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