Frank character (5)

I believe the answer is:

stamp

I believe this is a double definition.

'frank' is the first definition.
(frank can mean to mark with an official stamp)

'character' is the second definition.
(I've seen this in another clue)

(Other definitions for stamp that I've seen before include "Philatelist's item" , "contributions?" , "Seal" , "Item for philatelist" , "Cut out with a die" .)

I've seen this clue in The Times.

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