Hissy fit as drink's knocked back (5)
I believe the answer is:
strop
'hissy fit' is the definition.
I can't tell whether this definition defines the answer.
'drink's knocked back' is the wordplay.
'drink's' becomes 'ports' (port is a kind of drink).
'knocked back' shows that the letters should be reversed in order.
'ports' backwards is 'STROP'.
'as' is the link.
Can you help me to learn more?
(Other definitions for strop that I've seen before include "Razor sharpener" , "Fit of bad temper" , "Leather strap used to sharpen razors" , "temper tantrum" , "Prime cutthroat" .)