Produce green tea, perhaps (8)
I believe the answer is:
generate
'produce' is the definition.
(generating is a kind of producing)
'green tea perhaps' is the wordplay.
'perhaps' indicates anagramming the letters.
'green'+'tea'='greentea'
'greentea' is an anagram of 'GENERATE'.
(Other definitions for generate that I've seen before include "24 across (anag)" , "available in form" , "Engender" , "Produce - teenager (anag)" , "Produce (energy, etc)" .)