Meditate; chew the cud (8)
I believe the answer is:
ruminate
I believe this clue is a double definition.
'meditate' is the first definition.
(synonyms)
'chew the cud' is the second definition.
(synonyms)
(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" .)