Called in religion a meditation (5)
I believe the answer is:
named
'called' is the definition.
('name' can be a synonym of 'call')
'in religion a meditation' is the wordplay.
'in' indicates a hidden word.
'NAMED' is hidden within 'religion a meditation'.
(Other definitions for named that I've seen before include "Titled" , "Christened" , "Designated" , "Called" , "Identified by appellation" .)