Scoundrel in American intelligence finds bug (6)
I believe the answer is:
cicada
'bug' is the definition.
(I've seen this before)
'scoundrel in american intelligence' is the wordplay.
'scoundrel' becomes 'cad' (cad is a kind of scoundrel).
'in' indicates putting letters inside.
'american intelligence' becomes 'cia'.
'cad' going within 'cia' is 'CICADA'.
'finds' is the link.
(Other definitions for cicada that I've seen before include "Droning insect" , "Large bug" , "Shrill bug" , "Shrill insect" , "Loud chirping insect" .)