Informed of weekend ball, go crazy (13)
I believe the answer is:
knowledgeable
'informed' is the definition.
('knowledgeable' can be similar in meaning to 'informed')
'weekend ball go crazy' is the wordplay.
'crazy' indicates anagramming the letters.
'weekend'+'ball'+'go'='weekendballgo'
'weekendballgo' is an anagram of 'KNOWLEDGEABLE'.
'of' acts as a link.
(Other definitions for knowledgeable that I've seen before include "Conversant" , "Savvy" , "Intelligent and well-informed" , "Erudite" , "Well informed" .)