Familiar footwear (7)
I believe the answer is:
wellies
'footwear' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for wellies that I've seen before include "Rubber boots (colloq.)" , "Muddy footwear?" , "provincial students in the main" .)