Quick, some medication—I'm bleeding! (6)
I believe the answer is:
nimble
'quick' is the definition.
(I've seen this before)
'some medication-i'm bleeding' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'NIMBLE' can be found hidden inside 'medication im bleeding'.
(Other definitions for nimble that I've seen before include "'Agile, spry (6)'" , "Moving quickly and lightly" , "Light and quick in movement" , "Swift, active" , "Agile, sprightly" .)