Endorse university for American male (4)

I believe the answer is:

buck

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'male' is the definition.
(male deer)

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

(Other definitions for buck that I've seen before include "young man" , "Dandy" , "Antelope - dollar" , "Male animal - dollar" , "Male beast" .)

I've seen this clue in The Independent.

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