Crossword Genius

Among men, a rampaging Greek king (9)

Ross

I believe the answer is:

agamemnon

Here is my best explanation:

'greek king' is the definition.
(I've seen this before)

'among men a rampaging' is the wordplay.
'rampaging' indicates an anagram.
'among'+'men'+'a'='amongmena'
'amongmena' with letters rearranged gives 'AGAMEMNON'.

This clue was last seen in The Telegraph