__ of Wales, Norwegian queen 1905-1938 (4)
I believe the answer is:
maud
(Other definitions for maud that I've seen before include "Old song: ''Come into the garden . . . .''" , "Come into the garden, - (Tennyson)" , "Girl invited into the garden in song" , "Girl invited into garden (Tennyson)" , "Tennyson poem" .)