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Maths expert's lager tab is recalculated (10)


I believe the answer is:


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'maths' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'expert's lager tab is recalculated' is the wordplay.
'lager tab is' anagrams to 'ALGEBRAIST'.
However, I am not sure how this is indicated.

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I've seen this clue in The Independent.
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