What does the cryptic crossword clue "Spades cut in dull card game (5)" mean?

The definition is "card game". The wordplay uses a deletion. OMBRE (deletion) = OMBRE; definition: "card game" The answer is OMBRE.

Spades cut in dull card game (5)

Guardian Cryptic #28938 | 12 Across | 2022-12-12 flower