Most of the team having their mothers round (7)
I believe the answer is:
maximum
'most' is the definition.
(thesaurus)
'team having their mothers round' is the wordplay.
I cannot really understand how this works, but
'team' could be 'xi' (a football team, from Roman numerals for 11) and 'xi' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'of the' is the link.
Can you help me to learn more?
(Other definitions for maximum that I've seen before include "Upper limit" , "Top" , "Greatest amount" , "Largest in group of numbers" , "The largest possible quantity or degree" .)