Mobius strip's not that devious! (3-5)

I believe the answer is:

two-faced

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'devious' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

I don't understand how the remainder of the clue works.

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(Other definitions for two-faced that I've seen before include "Showing a double-sided visage to deceive" , "Hypocritical, like Janus" , "Hypocritical (like clock in tower?)" , "Double-meaning" , "Perfidious" .)

I've seen this clue in The Sun.

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