What does the cryptic crossword clue "Wounded? This will buck you up (4,2,3,3)" mean?

The definition is "Wounded? This will buck you up". The wordplay uses a double definition. Double definition The answer is SHOTINTHEARM.

Wounded? This will buck you up (4,2,3,3)

Guardian Cryptic #26837 | 4 Down | 2016-03-21 flower