Crossword Genius

Impressive character? (5)

Ross

I believe the answer is:

stamp

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'character?' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for stamp that I've seen before include "Trample" , "What to put on 7 before putting in 15" , "Bang foot down; (house sale) duty" , "Official mark; bang (foot)" , "Philatelist's item" .)

I've seen this clue in the Evening Standard.
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