Extremely successful game is played (4)

I believe the answer is:

mega

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'extremely successful' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'game is played' is the wordplay.
'is played' is an anagram indicator.
'game' with letters rearranged gives 'MEGA'.

Can you help me to learn more?

(Other definitions for mega that I've seen before include "Enormous; very good" , "Very large (colloq.)" , "ace" , "Huge (slang)" , "Great American" .)

I've seen this clue in The Mirror.

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