Put an end to fit of temper right away (4)
I believe the answer is:
stop
'put an end to' is the definition.
(I've seen this in another clue)
'fit of temper right away' is the wordplay.
'fit of temper' becomes 'strop'.
'right' becomes 'r' (abbreviation).
'away' indicates named letters should be taken away.
'strop' with 'r' taken out is 'STOP'.
(Other definitions for stop that I've seen before include "Close < finish" , "Quit" , "Cease, desist, whoa" , "Halt; finish" , "Knock out" .)