Classic hero of Dutch soccer? (4)

I believe the answer is:

ajax

I'm a little stuck... Click here to teach me more about this clue!

'classic hero' is the definition.
'ajax' can be an answer for 'hero' (I've seen this before). I'm unsure of the 'classic' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for ajax that I've seen before include "Swiftest Greek warrior in the Trojan War who killed himself" , "Cleaner" , "Greek hero of the Trojan war - Dutch football team" , "old privy" , "Son of Telamon, hero of Trojan War" .)

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