Soldiers overturned senior with a gun (8)
I believe the answer is:
regulars
'soldiers' is the definition.
(I've seen this before)
'overturned senior with a gun' is the wordplay.
'overturned' shows that the letters should be reversed in order.
'senior with' becomes 'sra' (I can't justify this - if you can you should believe this answer much more).
'a gun' becomes 'luger' (type of pistol).
'sra'+'luger'='sraluger'
'sraluger' backwards is 'REGULARS'.
Can you help me to learn more?
(Other definitions for regulars that I've seen before include "soldiers" , "Frequent customers of the local pub" , "The usual customers, of a pub say" .)