News of an explosion (6)
I believe the answer is:
report
This clue is a double definition.
'news' is the first definition.
(report is a kind of news)
'an explosion' is the second definition.
(I've seen this before)
'of' is the link.
(Other definitions for report that I've seen before include "Describe with a bang" , "Declaration" , "'Description, account (6)'" , "Noise - information" , "Statement - sound of a gun firing" .)