Material left during visit (6)
I believe the answer is:
'material' is the definition.
(I know that poplin is a type 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 present in the answer.
'during' could be 'in' (e.g. during February means in February) and 'in' is located in the answer.
The remaining letters 'pop' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for poplin that I've seen before include "Corded cotton fabric" , "Ribbed fabric" , "Lightweight corded cotton" , "stuff!" , "Material" .)