Cliffside debris (5)
I believe the answer is:
scree
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cliffside debris</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 scree that I've seen before include "bits of rock" , "Debris at the foot of a cliff" , "Safeguard" , "Small loose stones on a mountainside" , "Mass of loose rocks at the base of a cliff" .)