Situated within Japan, the only temple (8)

I believe the answer is:

pantheon

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'situated within japan the only temple' is the definition.
I can't tell whether this definition defines the answer.

'within japan the only temple' is the wordplay.
'within' indicates a hidden word.
'PANTHEON' can be found hidden inside 'japan the only temple'.

Can you help me to learn more?

(Other definitions for pantheon that I've seen before include "All the gods of a people or religion" , "Temple dedicated to all the gods" , "Circular temple in Rome" , "Ancient Roman temple" , "church" .)

I've seen this clue in The Telegraph.

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