Famous person playing god? (8)

I believe the answer is:

immortal

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'famous' is the definition.
(thesaurus)

'person playing god?' is the wordplay.
'person playing' becomes 'im' (I can't explain this - if you can you should give a lot more credence to this answer).
'god?' becomes 'mortal' (god is a kind of mortal).
'im'+'mortal'='IMMORTAL'

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(Other definitions for immortal that I've seen before include "Not subject to death" , "Great person" , "never to be forgotten" , "Living for ever" , "Living forever" .)

I've seen this clue in The Guardian.

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