Crossword Genius

Gives an impressive show of anger? (6)

Ross

I believe the answer is:

stamps

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'gives' is the definition.
The answer and definition can be both related to change as well as being verbs in their -s form.
Maybe they are linked in a way I don't understand?

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

Can you help me to learn more?

(Other definitions for stamps that I've seen before include "creates an impression" , "Gummed receipts of postal fees" , "Brings foot heavily to the ground, as in anger" , "Tokens stuck on letters" , "Philatelists collect them" .)

I've seen this clue in the Evening Standard.
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