Material left during visit (6)
I believe the answer is:
poplin
'material' is the definition.
(poplin is a kind of material)
'left during visit' is the wordplay.
I cannot really see how this works, but
'left' could be 'l' (common abbreviation) and 'l' is located in the answer.
'during' could be 'in' (e.g. during February means in February) and 'in' is present in the answer.
The remaining letters 'pop' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
(Other definitions for poplin that I've seen before include "Corded cotton fabric" , "Ribbed fabric" , "Lightweight corded cotton" , "stuff!" , "Material" .)