Worn-out shoe? (6)
I believe the answer is:
galosh
'shoe?' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for galosh that I've seen before include "singular footwear" , "Waterproof shoe" , "Wellington" , "Rubber overshoe" , "Waterproof overshoe" .)