Be fond of sage, too (8)
I believe the answer is:
likewise
'too' is the definition.
(I know that too can be written as likewise)
'be fond of sage' is the wordplay.
'be fond of' becomes 'like' (I've seen this in another clue).
'sage' becomes 'wise' (similar in meaning).
'like'+'wise'='LIKEWISE'
(Other definitions for likewise that I've seen before include "Similarly, moreover" , "In similar manner" , "Also; similarly" , "In a similar fashion" , "In similar way" .)