Location of Greek oracle guided retreating Greek character (6)
I believe the answer is:
delphi
'location of greek oracle' is the definition.
'Delphi' can be an answer for 'location' (Delphi is an example). I am not certain of the 'of greek oracle' bit.
'guided retreating greek character' is the wordplay.
'guided' becomes 'led' ('lead' can be a synonym of 'guide').
'retreating' says the letters should be written backwards.
'greek character' becomes 'phi' (letter from the Greek alphabet).
'led' backwards is 'del'.
'del'+'phi'='DELPHI'
Can you help me to learn more?
(Other definitions for delphi that I've seen before include "Where god used to speak" , "Temple site on Mt Parnassus" , "Home of the oracle on the slopes of Mount Parnassus" , "Greek site of Apollo's most famous oracle" , "Where Apollo's most famous oracle spoke in Greece" .)