Something you could possibly fire, keeping a level head (5)
I believe the answer is:
rifle
'something you' is the definition.
I can't tell whether this defines the answer.
'possibly fire keeping a level head' is the wordplay.
'possibly' indicates an anagram.
'keeping' indicates putting letters inside (some letters kept inside).
'head' indicates taking the first letters.
The initial letter of 'level' is 'l'.
'fire' with letters rearranged gives 'rife'.
'rife' going around 'l' is 'RIFLE'.
'could' acts as a link.
Can you help me to learn more?
(Other definitions for rifle that I've seen before include "disarray" , "One that has stock" , "Go through in search" , "Search and rob - with long gun?" , "Gun; thoroughly search" .)