Crossword Genius

Report forbidden joker on popular platform (9)

Ross

I believe the answer is:

bandwagon

I'm a little stuck... Click here to teach me more about this clue!

'popular platform' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'report forbidden joker on' is the wordplay.
'report' indicates a 'sounds like' (homophone) clue.
'forbidden' becomes 'banned' (banning is a kind of forbidding).
'joker' becomes 'wag' (I've seen this before).
'banned' is a homophone of 'band'.
'band'+'wag'+'on'='BANDWAGON'

Can you help me to learn more?

(Other definitions for bandwagon that I've seen before include "Fashionable movement" , "vehicle for musicians" , "something fashionable all of a sudden" , "everybody wants to be on it" , "Vehicle (jumped on when suddenly popular?)" .)

I've seen this clue in the Sydney Morning Herald.
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