She has a hole in a sandal perhaps (4)
I believe the answer is:
shoe
'a sandal perhaps' is the definition.
(sandal is a kind of shoe)
'she has a hole' is the wordplay.
'has' is an insertion indicator.
'a hole' becomes 'O' (O looks like a hole).
'she' placed around 'o' is 'SHOE'.
'in' is the link.
(Other definitions for shoe that I've seen before include "Pump, for example" , "Perhaps casual" , "something afoot" , "Plate on horse" , "Oxford, for instance" .)