Emphatically not just any part of Athens – it's in Parthenon (3)
I believe the answer is:
the
'emphatically not just any part of athens' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'in parthenon' is the wordplay.
'in' indicates the answer is hidden within the clue.
'THE' can be found hidden inside 'parthenon'.
'it's' acts as a link.
Can you help me to learn more?
(Other definitions for the that I've seen before include "and 24 Down: Similar things" , "Last words of story" , "The most frequently occurring word in the Bible (and in this clue!)" , "French drink" , "Base of ever-expanding nursery rhyme" .)