Criminal captured with this fool gunned down? (7)
I believe the answer is:
mugshot
'criminal captured' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'with this fool gunned down?' is the wordplay.
'with' means one lot of letters go next to another.
'this fool' becomes 'mug' (synonyms).
'gunned down?' becomes 'shot' (gunning down is a kind of shooting).
'mug' next to 'shot' is 'MUGSHOT'.
Can you help me to learn more?
(Other definitions for mugshot that I've seen before include "Photo of criminal" , "Passport photograph?" , "Still capturing the culprit" , "Photo of ones face" , "Photograph taken for police records" .)