Guns possibly heard around, when there's a war (8)
I believe the answer is:
hardware
'a war' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'guns possibly heard around' is the wordplay.
'guns' becomes 'war' (I can't justify this - if you can you should believe this answer much more).
'possibly' is an anagram indicator.
'around' is an insertion indicator.
'heard' with letters rearranged gives 'harde'.
'war' placed inside 'harde' is 'HARDWARE'.
'when there's' is the link.
Can you help me to learn more?
(Other definitions for hardware that I've seen before include "Domestic goods and tools - components of a computer system" , "Tackle" , "Household items" , "Military equipment" , "Mechanical equipment" .)