She may be an asset (5)

I believe the answer is:

tessa

'she' is the definition.

'may be an asset' is the wordplay.
'may be' indicates an anagram.
'asset' anagrammed gives 'TESSA'.

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

I've seen this clue in the Evening Standard.

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