Heard offspring made tea (6)
I believe the answer is:
brewed
'made tea' is the definition.
(I've seen this before)
'heard offspring' is the wordplay.
'heard' shows a homophone (sound like).
'offspring' becomes 'brood' (I've seen this before).
'brood' sounds like 'BREWED'.
(Other definitions for brewed that I've seen before include "ready to get drunk?" , "make beer" , "Made tea or beer" , "Made by boiling and fermentation, say beer" , "Fermented" .)