Hinders low fellows out to finish a job (5)

'hinders' is the definition.
The answer and definition can be both to do with social activities as well as being verbs in their -s form.
Perhaps there's an association between them I don't understand?

'low fellows out to finish a job' is the wordplay.
'low fellows' becomes 'curs' (I can't justify this - if you can you should give a lot more credence to this answer).
'out' means one lot of letters goes inside another.
'to finish' says to take the final letters.
The final letter of 'job' is 'b'.
'curs' placed around 'b' is 'CURBS'.

Can you help me to learn more?