Gratuities (4)
I believe the answer is:
tips
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">gratuities</span>' is the definition.<br/ ><span class="explanation-format__explanation">('tip' can be a synonym of 'gratuity')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tips that I've seen before include "Useful hints" , "Hints or gratuities" , "Ends" , "Areas for dumping waste" , "Turns over" .)