Crossword Genius

National Insurance in tax year is something worthless (6)

Ross

I believe the answer is:

vanity

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Here is my best explanation:

'something worthless' is the definition.

'national insurance in tax year' is the wordplay.
'national insurance' becomes 'ni' (UK tax).
'in' is an insertion indicator.
'tax' becomes 'vat' (British sales tax).
'year' becomes 'y'.
'ni' put inside 'vat' is 'vanit'.
'vanit'+'y'='VANITY'

'is' acts as a link.

Ross

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This clue was last seen in The Times

(Other definitions for vanity that I've seen before include "Conceit especially about appearance", "Excessive pride in one's self", "Excessive conceit", "Conceit; pointlessness", "Capacity for conceit", "Book by Thackeray", "Conceit about one's appearance", "William Makepeace Thackeray wrote '. . . . . . Fair'", "Narcissism" and "Conceitedness, self-love".)

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