The ultimate no-score game, maybe (5)
I believe the answer is:
omega
'the ultimate no-score game maybe' is the definition.
I can't tell whether this definition defines the answer.
'the ultimate no-score game' is the wordplay.
'the ultimate' says to take the final letters.
'score' is an anagram indicator (I've seen 'scored' mean this).
The final letter of 'no' is 'o'.
'game' is an anagram of 'mega'.
'o'+'mega'='OMEGA'
Can you help me to learn more?
(Other definitions for omega that I've seen before include "24th Greek letter" , "End of sequence" , "Last (Gk. letter)" , "character in Greek literature?" , ""The Alpha and the ___"" .)