Crossword Genius

Implied MP switching to Liberal is unlawful (7)

Ross

I believe the answer is:

illicit

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'is unlawful' is the definition.
(similar in meaning)

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

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(Other definitions for illicit that I've seen before include "breaking the law" , "Not approved by law" , "Without approval" , "Felonious" , "completely banned" .)

I've seen this clue in The Independent.
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