Revise a letter to a girl (5)
I believe the answer is:
edith
'girl' is the definition.
(I've seen this before)
'revise a letter' is the wordplay.
'revise' becomes 'edit' (I've seen this before).
'a letter' becomes 'h' ().
'edit'+'h'='EDITH'
'to a' acts as a link.
(Other definitions for edith that I've seen before include "Eg Cavell" , "Dame ----- Evans (1888-1976), stage and screen actress" , "Woman" , "Evans, Sitwell or Piaf" , "Cavell, Piaf or Wharton" .)