Spit out gratuities (4)
I believe the answer is:
tips
'gratuities' is the definition.
('tip' can be a synonym of 'gratuity')
'spit out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'spit' with letters rearranged gives 'TIPS'.
(Other definitions for tips that I've seen before include "Gratuties" , "leavings in restaurant?" , "Hints or gratuities" , "Ends" , "extra payments" .)