Joker to accept rising advocate of fast food? (5,6)

I believe the answer is:

wagyu burger

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

'fast food?' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'joker to accept rising advocate' is the wordplay.
'joker' becomes 'wag' (I've seen this before).
'to accept' becomes 'buy' (buying is a kind of accepting).
'rising' shows that the letters should be reversed in order (going up in a down clue).
'advocate' becomes 'urger' (I've seen this in another clue).
'buy' written backwards gives 'yub'.
'wag'+'yub'+'urger'='WAGYU BURGER'

'of' acts as a link.

Can you help me to learn more?

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

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.