She was exempt from tax (5)

I believe the answer is:

tessa

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'she' is the definition.

I don't understand how the rest of the clue works.

(Other definitions for tessa that I've seen before include "Girl's name, forerunner of ISA" , "Dahl or Jowell" , "Woman" , "Tax-exempt special savings account" , "Girl" .)

I've seen this clue in the Evening Standard.

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