Enjoy sage also (8)
I believe the answer is:
likewise
'also' is the definition.
('likewise' can be a synonym of 'also')
'enjoy sage' is the wordplay.
'enjoy' becomes 'like' (I've seen this before).
'sage' becomes 'wise' ('wise' can be similar in meaning to 'sage').
'like'+'wise'='LIKEWISE'
(Other definitions for likewise that I've seen before include "In similar manner" , "Also; similarly" , "Similarly, moreover" , "In a similar fashion" , "Ditto, similarly" .)