Major Chinese river (7)
I believe the answer is:
yangtze
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">major chinese river</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for yangtze that I've seen before include "Chinese river (Z, not S)" , "Longest Asian river" , "Major Chinese river" , "Longest river of Asia" , "Chinese river; Tyne zag (anag.)" .)