Youth, perhaps, brewed green tea (8)
I believe the answer is:
teenager
'youth perhaps' is the definition.
'brewed green tea' is the wordplay.
'brewed' indicates an anagram.
'green'+'tea'='greentea'
'greentea' with letters rearranged gives 'TEENAGER'.
(Other definitions for teenager that I've seen before include "Generate (anag)" , "one with an unpredictable nature" , "one no longer twelve?" , "hormonal problem?" , "Young person" .)