Name of woman getting letters from Royal Mail (4)
I believe the answer is:
alma
'name of woman' is the definition.
'letters from royal mail' is the wordplay.
'letters from' says the answer is hidden in the clue (a selection of letters from the clue).
'ALMA' is hidden within 'royal mail'.
'getting' acts as a link.
(Other definitions for alma that I've seen before include "dancing girl" , "Essence" , "The . . . . Mater is the old school" , "Battle of the -- was in the Crimean War" , "One's university" .)