Crossword Genius

Those one may 'lie in' are presumably false (5)

Ross

I believe the answer is:

teeth

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If this is the answer I cannot explain how the clue works.

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(Other definitions for teeth that I've seen before include "Gnashers" , "Bony structures for eating" , "Cog wheel projections" , "symbols of legal power?" , "Fangs" .)

I've seen this clue in the Evening Standard.
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