Marked with blotches (7)
I believe the answer is:
mottled
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">marked with blotches</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for mottled that I've seen before include "Blotchy" , "Marked with spots" , "with variable effect" , "Having blotches of colour" , "Marked with streaks or blotches" .)