Drinks knocked over in temper tantrum (5)
I believe the answer is:
strop
'temper tantrum' is the definition.
(I've seen this before)
'drinks knocked over' is the wordplay.
'drinks' becomes 'ports' (port is a kind of drink).
'knocked over' says the letters should be written backwards.
'ports' backwards is 'STROP'.
'in' acts as a link.
(Other definitions for strop that I've seen before include "temper tantrum" , "Bad mood; sharpen" , "Razor sharpener" , "Piece of leather on which razor is sharpened" , "Prime cutthroat" .)