Upper-case letter (7)
I believe the answer is:
capital
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">upper-case letter</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for capital that I've seen before include "liquid assets" , "Major city - investment - great!" , "Kabul or Harare?" , "A big letter, or a big city" , "It's jolly good in the great city" .)