Crossword Genius

Sandra , actress who played the title role in 1959 film comedy Gidget (3)

Ross

I believe the answer is:

dee

(Other definitions for dee that I've seen before include "Welsh/English river" , "Balmoral's river" , "Aberdeenshire river" , "Scottish river" , "River name" .)

I've seen this clue in The Mirror.
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