Discharge gun finally with a loud shot (6)
I believe the answer is:
unload
'discharge' is the definition.
(thesaurus)
'gun finally with a loud shot' is the wordplay.
'finally' says to take the final letters.
'with' means one lot of letters go next to another.
'shot' is an anagram indicator.
The final letter of 'gun' is 'n'.
'a'+'loud'='aloud'
'n' put after 'aloud' is 'aloudn'.
'aloudn' anagrammed gives 'UNLOAD'.
(Other definitions for unload that I've seen before include "Discharge cargo" , "Get rid" , "Take cargo off (a ship)" , "Remove cargo from ship or charge from gun" , "Remove cargo from ship or goods from lorry" .)