Good buy (7)
I believe the answer is:
bargain
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">good buy</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 bargain that I've seen before include "Negotiate terms" , "Cheap purchase" , "Great deal!" , "Discuss terms for buying" , "Haggle; a good deal" .)