My tea brewed to be substantial (5)
I believe the answer is:
meaty
'be substantial' is the definition.
(I've seen this in another clue)
'my tea brewed' is the wordplay.
'brewed' is an anagram indicator.
'my'+'tea'='mytea'
'mytea' is an anagram of 'MEATY'.
'to' acts as a link.
(Other definitions for meaty that I've seen before include "Substantive -- like beef or pork?" , "Heavily built" , "Fleshy, or full of informative matter" , "Brawny; full of substance" , "Hearty" .)