Woman of inestimable value (3)

I believe the answer is:

eva

'woman' is the definition.
(woman's name)

'of inestimable value' is the wordplay.
'of' says the answer is hidden in the clue.
'EVA' can be found hidden inside 'inestimable value'.

(Other definitions for eva that I've seen before include "Dame - - Turner, soprano" , "- Braun, Hitler's mistress" , "Little --, US pop singer" , "Braun, Brick or Peron" , "Braun or Peron, say" .)

I've seen this clue in the Evening Standard.

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