Conclusions of ball games being played (6)
I believe the answer is:
omegas
'conclusions' is the definition.
(omega is a kind of conclusion)
'ball games being played' is the wordplay.
'ball' becomes 'o' (letter resembling a ball).
'being played' indicates an anagram.
'games' anagrammed gives 'megas'.
'o'+'megas'='OMEGAS'
'of' is the link.
(Other definitions for omegas that I've seen before include "Foreign characters" , "Greek characters'" , "letters" , "Conclusions" .)