Contribute (6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">contribute</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for add that I've seen before include "Also" , "Reason for difficulty learning" , "Reckon" , "Total; put together" , "Sum (numbers)" .)