You're fond of sage? Me, too! (8)
I believe the answer is:
likewise
'me too' is the definition.
(I've seen this in another clue)
'you're fond of sage?' is the wordplay.
I cannot really understand how this works, but
'sage?' could be 'wise' ('wise' can be similar in meaning to 'sage') and 'wise' is found within the answer.
The remaining letters 'like' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for likewise that I've seen before include "Also; similarly" , "In similar way" , "Similarly, moreover" , "In a similar fashion" , "In similar manner" .)