Kidnapper's demand (6)
I believe the answer is:
ransom
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">kidnapper's demand</span>' is the definition.<br/ ><span class="explanation-format__explanation">(a kidnapper demands a ransom)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ransom that I've seen before include "Rescue" , "Payment, eg to kidnapper" , "Payment demanded for release of captive" , "Freedom payment" , "Fee for kidnap release" .)