Grave taxes can disrupt them (13)

I believe the answer is:

extravagances

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'them' is the definition.
I can't tell whether this definition defines the answer.

'grave taxes can disrupt' is the wordplay.
'disrupt' indicates anagramming the letters (I've seen 'disrupted' mean this).
'grave'+'taxes'+'can'='gravetaxescan'
'gravetaxescan' anagrammed gives 'EXTRAVAGANCES'.

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I've seen this clue in The Globe and Mail and The Irish Independent.

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