Support song engrossing millions watching from home (8)
I believe the answer is:
armchair
'engrossing millions watching from home' is the definition.
I can't judge whether this defines the answer.
'support song' is the wordplay.
'support' becomes 'arm' (arm is a kind of support).
'song' becomes 'chair' (I can't explain this - if you can you should believe this answer much more).
'arm'+'chair'='ARMCHAIR'
Can you help me to learn more?
(Other definitions for armchair that I've seen before include "Sort of detective" , "Comfy seat" , "Piece of furniture" , "Seat to relax in" , "Seat with side supports" .)