Information, that is, from Aladdin's slave (5)
I believe the answer is:
genie
'aladdin's slave' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'information that is' is the wordplay.
'information' becomes 'gen' (gen can informally mean information).
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'gen'+'ie'='GENIE'
'from' acts as a link.
Can you help me to learn more?
(Other definitions for genie that I've seen before include "Magician residing in a lamp" , "Spirit in a bottle" , "Arabian sprite" , "Magical Eastern spirit with strange powers" , "Goblin as found in Aladdin's lamp" .)