Ponder incomplete bonus level of computer game (11)
I believe the answer is:
multiplayer
'of computer game' is the definition.
(multiplayer can describe a type of computer game)
'ponder incomplete bonus level' is the wordplay.
'ponder' becomes 'mull' ('mull' can be a synonym of 'ponder').
'incomplete' means to remove the last letter.
'bonus' becomes 'tip' (I've seen this before).
'level' becomes 'layer'.
'mull' with its final letter removed is 'mul'.
'mul'+'tip'+'layer'='MULTIPLAYER'
I've seen this clue in The Independent.
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