Chartreuse drunk with round can be risky (11)
I believe the answer is:
treacherous
'be risky' is the definition.
(thesaurus)
'chartreuse drunk with round' is the wordplay.
'drunk with' indicates an anagram.
'round' becomes 'o' (o is a circular letter).
'chartreuse' mixed up with 'o' makes 'TREACHEROUS'.
'can' acts as a link.
(Other definitions for treacherous that I've seen before include "Not to be trusted" , "Not true" , "covered in ice?" , "Ready to betray" , "Unreliable" .)