Muffed sitter in computer game (6)
I believe the answer is:
tetris
'computer game' is the definition.
(Tetris is a video game series)
'muffed sitter' is the wordplay.
'muffed' indicates anagramming the letters (letters muffed or messed up).
'sitter' anagrammed gives 'TETRIS'.
'in' acts as a link.
I've seen this clue in The Guardian.
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