In most cases information really varied (9)
I believe the answer is:
generally
'in most cases' is the definition.
(I've seen this before)
'information really varied' is the wordplay.
'information' becomes 'gen' (gen can informally mean information).
'varied' is an anagram indicator.
'really' anagrammed gives 'erally'.
'gen'+'erally'='GENERALLY'
(Other definitions for generally that I've seen before include "Usually, as a rule" , "For the most part" , "In most cases, as a general rule" , "most of the time" , "as usual" .)