Buy and sell (5)
I believe the answer is:
trade
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">buy</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">sell</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(trading is a kind of selling)</span><br/ ><br/ >'<span class="explanation-format__original">and</span>' acts as a link.<br/ ></span>
(Other definitions for trade that I've seen before include "Buying/selling of goods" , "Dealing in goods" , "Commercial exchange of goods and services" , "Calling" , "A skilled craft to earn living" .)