Petrol seller (6)
I believe the answer is:
garage
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">petrol seller</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 garage that I've seen before include "Where car is housed" , "Building for a car, or for its maintenance" , "Carport" , "Car shed" , "Building for housing or repairing car" .)