Cash in (a coupon) (6)
I believe the answer is:
redeem
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cash in a coupon</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 redeem that I've seen before include "Recover from the pawnshop" , "take back pawn move" , "Save or cash in" , "Save from hell - or from pawnshop" , "Avoid pawn loss" .)