It's astonishing to check out music press ahead of gig (3,7)

I believe the answer is:

eye-popping

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'it's astonishing' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Another definition for eye-popping that I've seen is " Astonishing".)

I've seen this clue in the Irish Times.

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