Good to remove part of rifle (8)
I believe the answer is:
gunstock
'part of rifle' is the definition.
'gunstock' can be an answer for 'part' (gunstock is a kind of part). I am not sure about the 'of rifle' bit.
'good to remove' is the wordplay.
I cannot quite see how this works, but
'good' could be 'g' (abbreviation) and 'g' is found within the answer.
'to' is within the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for gunstock that I've seen is " Part of a hand weapon".)