Heaven (8)
'heaven' is the definition.
(synonyms)
This is all the clue.
(Other definitions for nirvana that I've seen before include "'Transcendent state, the final goal of Buddhism (7)'" , "State of pure happiness" , "religious state" , "Buddhist blessed extinction" , "Transcendent state of Buddhists" .)
'heaven' is the definition.
(paradise is a kind of heaven)
This is all the clue.
(Other definitions for paradise that I've seen before include "park" , "Heaven; Eden" , "Idyllic place" , "Heaven, nirvana, Valhalla etc" , "Shangri-La?" .)