Information still absorbing one's time (9)
I believe the answer is:
statistic
'information' is the definition.
(statistic is a kind of information)
'still absorbing one's time' is the wordplay.
'still' becomes 'static' (synonyms).
'absorbing' means one lot of letters goes inside another.
'one's' becomes 'I's' (Roman numeral).
'time' becomes 't' (abbreviation).
'is'+'t'='ist'
'static' placed around 'ist' is 'STATISTIC'.
(Other definitions for statistic that I've seen before include "Piece of data" , "It could be vital" , "E.g. crime figure" , "One single item of data" , "part of a table perhaps" .)