Left got wise (7)
I believe the answer is:
learned
'wise' is the definition.
(I've seen this before)
'left got' is the wordplay.
'left' becomes 'l' (common abbreviation).
'got' becomes 'earned' (earning is a kind of getting).
'l'+'earned'='LEARNED'
(Other definitions for learned that I've seen before include "Acquired and digested knowledge" , "Gained knowledge" , "Having great knowledge" , "Well educated and knowledgeable" , "Erudite - academic" .)