Crossword Genius

Endorse a letter (7)

Ross

I believe the answer is:

initial

This clue is a double definition.

'endorse' is the first definition.
(I've seen this before)

'a letter' is the second definition.
(initial is a kind of letter)

(Other definitions for initial that I've seen before include "Name's first letter", "Sign", "Let; rent", "Word's first letter", "Occurring at the start".)

I've seen this clue in Evening Standard.
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