Correction from mining engineer after reform without worker (9)
I believe the answer is:
amendment
'correction from mining engineer' is the definition.
'amendment' can be an answer for 'correction' (amendment is a kind of correction). I am unsure of the 'from mining engineer' bit.
'after reform without worker' is the wordplay.
'after' means one lot of letters go next to another.
'reform' becomes 'amend' (I've seen this in another clue).
'without worker' becomes 'ment' (I can't explain this - if you can you should believe this answer much more).
'amend' put next to 'ment' is 'AMENDMENT'.
Can you help me to learn more?
(Other definitions for amendment that I've seen before include "Revision" , "Change designed to improve a text" , "Minor improvement" , "A qualification" , "maybe fifth taken by US criminal" .)