Monetary benefit for going back in the mine (6)
I believe the answer is:
profit
'monetary benefit' is the definition.
'profit' can be an answer for 'benefit' (I've seen this before). I am not sure about the 'monetary' bit.
'for going back in the mine' is the wordplay.
'going back' is a reversal indicator.
'in the' indicates putting letters inside.
'mine' becomes 'pit' (down the pit).
'for' written backwards gives 'rof'.
'rof' placed into 'pit' is 'PROFIT'.
Can you help me to learn more?
(Other definitions for profit that I've seen before include "Gain, return on investment" , "It's gained on a transaction" , "Yield - gain" , "Clean up" , "Money made" .)