A one-way girl (4)

I believe the answer is:

anne

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

'a one-way' is the wordplay.
'one way' becomes 'nne' (I am not sure about this - if you are sure you should believe this answer much more).
'a'+'nne'='ANNE'

Can you help me to learn more?

(Other definitions for anne that I've seen before include "First queen of Great Britain and Ireland" , "Female name" , "Boleyn or Hathaway, say" , "Second or fourth wife of Henry VIII" , "One of the Bronte' tens" .)

I've seen this clue in the Evening Standard.

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