Shot heard near a compound (7)
I believe the answer is:
ammonia
'compound' is the definition.
The definition and answer can be both substances as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'shot heard near a' is the wordplay.
'shot' becomes 'ammo' (ammunition).
'heard near' becomes 'ni' (I am not sure about this - if you are sure you should believe this answer much more).
'ammo'+'ni'+'a'='AMMONIA'
Can you help me to learn more?
(Other definitions for ammonia that I've seen before include "Powerful cleaner" , "Acrid gas, NH3" , "compound?" , "Pungent gas formed of nitrogen and hydrogen" , "Colourless pungent gas" .)