Crossword Genius

Not having the front seat on a tandem's rotten (5)

Ross

I believe the answer is:

addle

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'rotten' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

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(Other definitions for addle that I've seen before include "Get rotten" , "(Of eggs) become rotten" , "Muddle or confuse" , "Make rotten" , "Make confused - go bad" .)

I've seen this clue in The Independent.
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