Slope downwards (3)
I believe the answer is:
dip
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">slope downwards</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for dip that I've seen before include "may be lucky at the fete?" , "Pickpocket's" , "Immerse briefly in liquid" , "Depression in a surface" , "Sink; immerse" .)