26 across
An
interval
before
VAT
comes
back
reduced
(6)
An interval before VAT comes back reduced (6)
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The definition is at the beginning of the clue.
How the clue works
An interval is your definition — think musical rather than temporal here. Hidden inside "beforE VAT COmes" are the letters you need, and when you flip them back to front ("comes back"), out pops the answer, with "reduced" nudging you towards taking just that slice of the phrase.