Tricky ruse is potential danger to state (8,4)
I believe the answer is:
security risk
'danger to state' is the definition.
I can't tell whether this definition defines the answer.
'tricky ruse is potential' is the wordplay.
'potential' is an anagram indicator (another potential order of the letters).
'tricky'+'ruse'+'is'='trickyruseis'
'trickyruseis' anagrammed gives 'SECURITY RISK'.
Can you help me to learn more?
(Another definition for security risk that I've seen is " One likely to divulge state secrets".)