Item of footwear, skate perhaps? (7)
I believe the answer is:
slipper
'item of footwear' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for slipper that I've seen before include "Comfortable footwear" , "Indoor footwear" , "Casual footwear" , "Beat; mule" , "House shoe" .)