Hill-climbing gear? (3)
I believe the answer is:
low
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hill-climbing gear?</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for low that I've seen before include "Make a cow-like noise" , "Not high or tall" , "Deep; moo" , "Dejected; moo" , "Without great height" .)