Crossword Genius

Open acknowledgement of entry without charge (4,9)

Ross

I believe the answer is:

free admission

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'entry without charge' is the definition.
I can't tell whether this defines the answer.

'open acknowledgement' is the wordplay.
'open' becomes 'free' (similar in meaning).
'acknowledgement' becomes 'admission' (admission is a kind of acknowledgement).
'free'+'admission'='FREE ADMISSION'

'of' is the link.

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I've seen this clue in The Irish News.
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