Luger pistol at the front modified with a silencer (7)
I believe the answer is:
earplug
'silencer' is the definition.
(I've seen this before)
'luger pistol at the front modified' is the wordplay.
'the front' says to take the initial letters.
'modified' is an anagram indicator.
The initial letters of 'pistol at' is 'pa'.
'luger'+'pa'='lugerpa'
'lugerpa' with letters rearranged gives 'EARPLUG'.
'with a' is the link.
(Other definitions for earplug that I've seen before include "protection for delicate drum" , "Device to keep out noise" , "affording protection for organ" , "It blocks out sound" , "Sound excluder" .)