Temper raging initially in bar (5)
I believe the answer is:
strop
'temper' is the definition.
(I've seen this before)
'raging initially in bar' is the wordplay.
'raging initially' becomes 'r' (I am not sure about this - if you are sure you should believe this answer much more).
'in' means one lot of letters goes inside another.
'bar' becomes 'stop' (bar can mean to stop or prevent).
'r' placed within 'stop' is 'STROP'.
Can you help me to learn more?
(Other definitions for strop that I've seen before include "Bad temper - sharpen (a razor)" , "Display of temper" , "Strip of leather on which razor is sharpened" , "Prime cutthroat" , "Paddy" .)