Went "Ptui!" (4)
I believe the answer is:
spat
'went ptui' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for spat that I've seen before include "Quarrel; oyster spawn" , "Minor conflict" , "Small row between Pats" , "Unimportant quarrel between Pats" , "Gestured with contempt" .)