Blend gradually (4)
I believe the answer is:
meld
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">blend gradually</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for meld that I've seen before include "Blend, combine" , "Merge" .)