What does the cryptic crossword clue "Extract from Othello - 'green-eyed monster' (4)" mean?

The definition is "monster'". The wordplay uses a hidden word. Hidden in "extract from othellO - 'GREen-eyed monster'" The answer is OGRE.

Extract from Othello - 'green-eyed monster' (4)

Independent Cryptic #11781 | 4 Down | 2024-07-13 flower