Edgar and Edmund kept computer systems corrected (6)
I believe the answer is:
edited
'corrected' is the definition.
(I've seen this before)
'edgar and edmund kept computer systems' is the wordplay.
'edgar' becomes 'ed' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'and' is a charade indicator (letters next to each other).
'edmund' becomes 'ed'.
'kept' means one lot of letters goes inside another.
'computer systems' becomes 'it' (I've seen this in other clues).
'ed'+'ed'='eded'
'eded' enclosing 'it' is 'EDITED'.
Can you help me to learn more?
(Other definitions for edited that I've seen before include "Changed text" , "altered for publication" , "Entrust, commit, deliver" , "Prepared a paper" , "Redacted" .)