Meditate; chew the cud (8)
I believe the answer is:
ruminate
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">meditate</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">chew the cud</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for ruminate that I've seen before include "Think over - as cows do?" , "'Reflect deeply, chew the cud (8)'" , "Contemplate" , "Ponder or meditate in mature way" , "Muse" .)