The Python Years diarist (5)
I believe the answer is:
palin
'the python years diarist' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for palin that I've seen before include "US politician" , "Michael - - (TV comedy, travel)" , "Michael --, comedian" , "Michael --, Python" , "Michael - - (TV traveller)" .)