Conventional — flavour (7)
I believe the answer is:
vanilla
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">conventional</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">flavour</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(vanilla is a type of flavour)</span><br/ ><br/ ></span>
(Other definitions for vanilla that I've seen before include "Flavouring from pod of certain orchids" , "without additions" , "type of orchid" , "Nice flavouring for ice-cream" , "Orchid, its pod, bean for flavouring" .)