Prepare a letter for a woman (5)

I believe the answer is:

edith

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

'prepare a letter' is the wordplay.
'prepare' becomes 'edit' (I can't explain this - if you can you should give a lot more credence to this answer).
'a letter' becomes 'h'.
'edit'+'h'='EDITH'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for edith that I've seen before include "and 19 Across: 'Little Sparrow'" , "Evans, Sitwell or Piaf" , "Woman" , "girl" , "Dame ----- Evans (1888-1976), stage and screen actress" .)

I've seen this clue in the Evening Standard.

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