Very large drilling article close to mine shaft (4)
I believe the answer is:
axle
'shaft' is the definition.
(I know that axle is a type of shaft)
'very large drilling article close to mine' is the wordplay.
'very large drilling article' becomes 'axl' (I can't justify this - if you can you should give a lot more credence to this answer).
'close to' indicates one should take the final letters (the 'close' to the word).
The final letter of 'mine' is 'e'.
'axl'+'e'='AXLE'
Can you help me to learn more?
(Other definitions for axle that I've seen before include "revolver in one" , "Rod connecting wheels" , "Rod at centre of wheel" , "Bar on which wheels rotate" , "Spindle between wheels" .)