Looking up a little information (4)
I believe the answer is:
data
'information' is the definition.
(data are bits of information)
'looking up a little' is the wordplay.
'looking up' is a reversal indicator (in a down clue, letters go up).
'little' becomes 'tad' (both can mean a small amount).
'a'+'tad'='atad'
'atad' backwards is 'DATA'.
(Other definitions for data that I've seen before include "tables, perhaps" , "Known facts" , "Facts and figures as processed by computer" , "Raw facts" , "Organised information" .)