Rick (6)
I believe the answer is:
sprain
'rick' is the definition.
(I know that rick can be written as sprain)
This is the entire clue.
(Other definitions for sprain that I've seen before include "Pulled muscle" , "Wrench a joint" , "Slight muscle injury, eg to ankle" , "Twist ligament(s)" , "Wrench (ligaments)" .)