Abundantly (2,6)
(Other definitions for in spades that I've seen before include "Decidedly" , "To have lots of it" , "by the yard" , "to a great extent" , "Unquestionably - how a bridge hand might be played?" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">abundantly</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>