Learned it's true I'd gone out East (7)
I believe the answer is:
'learned' is the definition.
'true i'd gone out east' is the wordplay.
'gone out' indicates anagramming the letters.
'east' becomes 'e' (synonyms).
'trueid' with letters rearranged gives 'erudit'.
'it's' acts as a link.
(Other definitions for erudite that I've seen before include "Having or showing great knowledge or learning", "Rue diet for the learned", "Due rite (anag.)", "Learned and scholarly", "Rude tie (anag.)".)