Putin transformed data (5)
I believe the answer is:
input
'data' is the definition.
(data put into a system)
'putin transformed' is the wordplay.
'transformed' indicates anagramming the letters.
'putin' is an anagram of 'INPUT'.
(Other definitions for input that I've seen before include "data-feed" , "supply" , "Contribution of work or information" , "store" , "contributed information" .)