Pressed (down) (6)
I believe the answer is:
tamped
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">pressed down</span>' is the definition.<br/ ><span class="explanation-format__explanation">('tamp' can be a synonym of 'press down')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tamped that I've seen before include "Packed down tightly like tobacco in pipe" , "Packed or rammed down tightly" .)