A free ticket will be acceptable (4)

I believe the answer is:

pass

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

'a free ticket' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

(Other definitions for pass that I've seen before include "Amatory advance" , "what the Galibier is" , "Bad situation" , "pointless bid" , "way through mountains" .)

I've seen this clue in the Evening Standard.

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