Foot division (4)
I believe the answer is:
inch
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">foot division</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for inch that I've seen before include "One-twelfth of a foot" , "See 12" , "Imperial unit of length" , "Move slowly and cautiously" , "2.45 cm" .)