Southern Greek character cross about knight and mythical monster (6)
I believe the answer is:
sphinx
'mythical monster' is the definition.
(Sphinx is an example)
'southern greek character cross about knight' is the wordplay.
'southern' becomes 's' (abbreviation).
'greek character' becomes 'phi' (letter from the Greek alphabet).
'cross about knight' becomes 'nx' (I can't justify this - if you can you should give a lot more credence to this answer).
's'+'phi'+'nx'='SPHINX'
'and' acts as a link.
Can you help me to learn more?
(Other definitions for sphinx that I've seen before include "Egypt. monster statue" , "Monster of Egyptian statuary" , "Mythological riddler" , "Oedipus solved her riddle" , "Figure at Giza in Egypt" .)