Bullish
'bullish' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for taurine that I've seen before include "Resembling a bull" , "To do with bulls, bull-like" , "Bully" , "Nature I associate with bull" , "Ruinate, being like bull" .)
(Other definitions for upbeat that I've seen before include "Cheerfully optimistic" , "Of mood, cheerful and optimistic" , "in every bar" , "Promising" , "Cheerful and encouraging, like lively music" .)