Island hard on footwear we hear (6)
I believe the answer is:
honshu
'island' is the definition.
(I know that Honshu is a island)
'hard on footwear we hear' is the wordplay.
I cannot really see how this works, but
'hard' could be 'h' (abbreviation used in pencil classifications) and 'h' is found in the answer.
'on' is found in the answer.
The remaining letters 'shu' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for honshu that I've seen before include "Largest of the Japanese islands" , "The largest island unit of Japan" , "The main island of Japan" , "Largest island of mainland Japan" , "Largest of the islands forming Japan" .)