Opposable digit (5)
I believe the answer is:
thumb
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">opposable digit</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 thumb that I've seen before include "Stubby digit?" , "Opposable digit" , "Hitch-hiking digit" , "Quickly turn pages" , "''Tom ..., the piper's son'' (nursery rhyme)" .)