TV's Bruce mostly drinks American blend (6)
I believe the answer is:
fusion
'blend' is the definition.
(I've seen this before)
'tv's bruce mostly drinks american' is the wordplay.
I cannot really see how this works, but
'american' could be 'us' (abbreviation for United States) and 'us' is found within the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for fusion that I've seen before include "Merger into one" , "Atomic reaction" , "Process of melting to join two or more into one" , "Unification, maybe nuclear" , "Process of melting together" .)