Work, not starting stoppage, making lucrative discovery (3,6)

'lucrative discovery' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'work not starting stoppage making' is the wordplay.
'work' becomes 'toil' (toiling is a kind of working).
'not starting' means to remove the first letter.
'stoppage making' becomes 'strike' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'toil' with its initial letter removed is 'oil'.
'oil'+'strike'='OIL STRIKE'

Can you help me to learn more?