What does the cryptic crossword clue "Monster depriving old horseman of oxygen (6)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Monster depriving old horseman of oxygen (6)

Guardian Cryptic #28579 | 1 Down | 2021-10-18 flower

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