Become liable (5)
I believe the answer is:
incur
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">become liable</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for incur that I've seen before include "Become subject to (penalty)" , "Become liable or subject to" , "Bring upon oneself - be liable for" , "Bring something unpleasant on oneself (5)" , "Arouse" .)