It's used by a shoemaker after all the others (4)
I believe the answer is:
last
'after all the others' is the definition.
(I've seen this before)
'it's used by a shoemaker' is the wordplay.
'it' becomes ''t' (abbreviation. e.g. in 'tis).
'used by' means one lot of letters go next to another.
'a shoemaker' becomes 'las' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
't' put after 'las' is 'LAST'.
Can you help me to learn more?
(Other definitions for last that I've seen before include "End" , "Endure - this clue is!" , "Least likely" , "model for a leprechaun" , "Piece of cobbler's equipment" .)