Bag round tip that is black, for refuse collector (7,3)
I believe the answer is:
wheelie bin
'refuse collector' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'bag round tip that is black' is the wordplay.
I cannot quite understand how this works, but
'tip' could be 'heel' (I've seen this before) and 'heel' is found in the answer.
'black' could be 'b' (abbreviation as in pencil classifications) and 'b' is located in the answer.
'that is' could be 'ie' (short for Latin 'id est', 'that is') and 'ie' is located in the answer.
The remaining letters 'win' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'for' is the link.
Can you help me to learn more?
(Other definitions for wheelie bin that I've seen before include "Portable refuse collector" , "Moveable garbage container" , "dirty vessel" .)