'snipe' = anagram of 'pines' (worries about).
'discharging' = indicator of anagram.
'r' = abbreviation for rifle; this is appended to the other letters.
Alternatively, a better interpretation is probably...
'snipe' = anagram of 'pines' (worries).
'about' = indicator of anagram.
'r' = abbreviation for rifle; this is placed (discharged?) after the other letters.