Drink to (5)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">drink to</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for toast that I've seen before include "Raising of glasses" , "Celebrate" , "Make bread brown and crisp" , "Raise a glass to (someone)" , "Breakfast item served in rounds" .)