Was on top of the bill, with brow wrinkled (9)

I believe the answer is:

headlined

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'was on top' is the definition.
I can't judge whether this definition defines the answer.

'bill with brow wrinkled' is the wordplay.
'bill' becomes 'ad' (advertisement stuck on wall).
'with' means one lot of letters go next to another.
'brow' becomes 'he' (I can't explain this - if you can you should believe this answer much more).
'wrinkled' becomes 'lined' (I've seen this before).
'ad' after 'he' is 'head'.
'head'+'lined'='HEADLINED'

'of the' acts as a link.

Can you help me to learn more?

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

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