Impressive character? (5)
I believe the answer is:
stamp
'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" .)