Threatening to execute you and me over outrage (9)
I believe the answer is:
dangerous
'threatening' is the definition.
(thesaurus)
'execute you and me over outrage' is the wordplay.
'execute' becomes 'do' (doing is a kind of executing).
'you and me' becomes 'us'.
'over' is an insertion indicator.
'outrage' becomes 'anger' (I've seen this in other clues).
'do'+'us'='dous'
'dous' enclosing 'anger' is 'DANGEROUS'.
'to' acts as a link.
(Other definitions for dangerous that I've seen before include "posing risk" , "Pope: 'A little learning is a . . . . . . . . . thing'" , "High-risk" , "likely to blow up" , "Harmful, injurious" .)