Wounded? This will give you a boost (4,2,3,3)
I believe the answer is:
shot in the arm
'wounded?' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for shot in the arm that I've seen before include "Wounded" , "This will buck you up" , "Stimulus" , "Winged" , "Anything that makes one feel encouraged" .)