Fall in value (10)
I believe the answer is:
depreciate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fall in value</span>' is the definition.<br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for depreciate that I've seen before include "Belittle; lose value" , "Lose value with time" , "Gradually lose value" .)