Gin accompaniment (5)
I believe the answer is:
tonic
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">gin accompaniment</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tonic that I've seen before include "fizz" , "that may be mixed with gin" , "Restorative that invigorates" , "shot in the arm" , "Quinine water" .)