Adjust to fit (5)
I believe the answer is:
adapt
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">adjust to fit</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 adapt that I've seen before include "get used?" , "Accommodate" , "Adjust to new use" , "Adjust to changed circumstances" , "Modify; acclimatise" .)