Sound made by soldier in pub (7)
I believe the answer is:
logical
'sound' is the definition.
(thesaurus)
'soldier in pub' is the wordplay.
'soldier' becomes 'gi' (government issue or general issue).
'in' means one lot of letters goes inside another.
'pub' becomes 'local' (I've seen this before).
'gi' put into 'local' is 'LOGICAL'.
'made by' is the link.
(Other definitions for logical that I've seen before include "Clearly and soundly reasoned" , "Based on reason" , "entirely reasonable" , "Following correct reasoning" , "Using reason" .)