Is the right size (4)
I believe the answer is:
fits
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">is the right size</span>' is the definition.<br/ ><span class="explanation-format__explanation">('fit' can be a synonym of 'be the right size')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for fits that I've seen before include "crises once" , "Paroxysms" , "Seizures" , "short bouts" , "Sudden uncontrollable attacks" .)