Information that is for one fulfilling wishes (5)
I believe the answer is:
genie
'one fulfilling wishes' is the definition.
(genies grant wishes)
'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'
'for' is the link.
(Other definitions for genie that I've seen before include "Arabian jinn or spirit" , "Magician residing in a lamp" , "Arabian sprite" , "Arabian spirit as in Aladdin's lamp" , "In Arabian Nights, a magic goblin" .)