Expectorated (4)
I believe the answer is:
spat
'expectorated' is the definition.
(spitting is a kind of expectorating)
This is all the clue.
(Other definitions for spat that I've seen before include "Pat's involved in squabble" , "Unimportant quarrel between Pats" , "Old leg wear - brief quarrel" , "Small altercations between Pats" , "Expectorated in slight quarrel" .)