Injury worry (6)
I believe the answer is:
strain
This clue is a double definition.
'injury' is the first definition.
(I know that strain is a type of injury)
'worry' is the second definition.
(thesaurus)
(Other definitions for strain that I've seen before include "tax" , "Stress or make taut" , "Exert oneself to the utmost" , "Music" , "Pour through a sieve" .)