Biased – as a Mobius strip? (3-5)

I believe the answer is:

one-sided

(Other definitions for one-sided that I've seen before include "Unfair or partisan - single dimension?" , "Unbalanced" , "So denied being unfair or biased" , "Unfairly biased" , "Indeed so (anag.)" .)

I've seen this clue in The Guardian.

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