Complete rascal not breaking law! (8)

I believe the answer is:

implicit

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'complete' is the definition.
(thesaurus)

'rascal not breaking law' is the wordplay.
'rascal' becomes 'imp' (synonyms).
'not breaking law' becomes 'licit' (I can't justify this - if you can you should believe this answer much more).
'imp'+'licit'='IMPLICIT'

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(Other definitions for implicit that I've seen before include "Understood but not openly stated" , "I clip Tim (anag.)" , "meaning is obvious?" , "Not actually stated" , "Implicit" .)

I've seen this clue in The Telegraph, The Independent and The Sun.

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