Inform of shot (6)
I believe the answer is:
report
I believe this clue is a double definition.
'inform' is the first definition.
(I know that report is a kind of inform)
'shot' is the second definition.
(report can mean a gunshot)
'of' acts as a link.
(Other definitions for report that I've seen before include "Gunfire noise; rumour" , "Account, of news say" , "Announce; gunshot" , "Statement of fact" , "Explosion" .)