Crossword Genius

Expose falsehood with this or let deceit run free


I believe the answer is:

lie detector

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'expose falsehood with this' is the definition.
The definition suggests a singular noun which matches the answer.

'let deceit run free' is the wordplay.
'run' indicates an anagram.
'free' becomes 'or' (I can't justify this - if you can you should give a lot more credence to this answer).
'letdeceit' with letters rearranged gives 'liedetect'.

'or' acts as a link.

Can you help me to learn more?

(Other definitions for lie detector that I've seen before include "Forensic equipment" , "Editor elect (anag.)" , "this could indicate a crime" , "way to discover fiction" , "Police polygraph" .)

I've seen this clue in The Telegraph.
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