Calmness certainly follows work injury claim (9)
I believe the answer is:
composure
'calmness' is the definition.
(synonyms)
'certainly follows work injury claim' is the wordplay.
I cannot quite understand how this works, but
'certainly' could be 'sure' (synonyms) and 'sure' is found in the answer.
The remaining letters 'compo' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for composure that I've seen before include "tranquillity" , "Calm self-control" , "Coolness" , "State of calmness" , "Calmness and self-control" .)