A kind letter (9)

I believe the answer is:

character

This clue is a double definition.

'a kind' is the first definition.
(thesaurus)

'letter' is the second definition.
(I've seen this before)

(Other definitions for character that I've seen before include "Nonconformist" , "Person in a play; letter" , "Distinctive nature" , "crank" , "Stamp < letter" .)

I've seen this clue in the Evening Standard.

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