Crossword Genius

Prefix with -tonic

Ross

I believe the answer is:

iso

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">prefix with tonic</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 iso that I've seen before include "sort of replay" , "Replay facility" .)

I've seen this clue in The New York Times.
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