My starting part discerns the green from white and blue and red;
I use it to describe myself, agree with what's been said.
My second part's an aurous lass, a symbol of a state,
dilemma of a Nordic prince, result that's almost great.
My third part is an old film of a manhunt really tense,
and it describes one kilo or a shirt that's not immense.
My fourth describes an ocean, or a colour, thoughts profound;
a voice that sounds impressive, something buried underground.
My fifth describes an ocean, or some music, thoughts of woe;
you look up on a cloudless day, and off to jail you go.
My whole describes a mind that really turned out quite elite;
to beat us at our own game was a truly monstrous feat.
Who am I?