He refuses to work and becomes violent (7)
I believe the answer is:
striker
'he refuses' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'work and becomes violent' is the wordplay.
I cannot quite understand how this works, but
'work' could be 'strike' (striking is a kind of working) and 'strike' is found within the answer.
A single letter 'r' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
'to' is the link.
Can you help me to learn more?
(Other definitions for striker that I've seen before include "disaffected employee" , "he's still batting" , "Worker engaged in official anti-employer action" , "Batsman facing the bowling" , "Perhaps a match" .)