Motorcycle attachment - or cocktail (7)
I believe the answer is:
sidecar
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">motorcycle attachment</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">cocktail</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that Sidecar is a type of cocktail)</span><br/ ><br/ ></span>
(Other definitions for sidecar that I've seen before include "Where a passenger may go" , "Passenger carrier attached to a motorcycle" , "Motorcycle addition" , "Attachment to motor cycle" , "Tipple" .)