Upper-case letters (8)
I believe the answer is:
capitals
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">upper-case letters</span>' is the definition.<br/ ><span class="explanation-format__explanation">('capital' can be a synonym of 'upper-case letter')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for capitals that I've seen before include "LETTERS LIKE THESE" , "Great cities or large letters" , "Upper-case letters" , "E.g. PARIS, ROME" , "First letters and first cities" .)