Put a cap on (5)
I believe the answer is:
limit
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">put a cap on</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 limit that I've seen before include "Breaking point" , "Utmost" , "qualify?" , "Extreme point" , "Keep in" .)