There’s no comeback from this barbaric war on piety (3-3,4)

I believe the answer is:

one-way trip

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'there's no comeback from' is the definition.
I know nothing about this answer so I can't judge whether this works.

'barbaric war on piety' is the wordplay.
'barbaric' is an anagram indicator (a rough or barbaric form of the letters).
'war'+'on'+'piety'='waronpiety'
'waronpiety' anagrammed gives 'ONE-WAY TRIP'.

'this' acts as a link.

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

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