Skirt gets drink stain at the top (6)
I believe the answer is:
margin
'skirt' is the definition.
(thesaurus)
'drink stain at the top' is the wordplay.
'drink' becomes 'gin' (gin is a kind of drink**).
'stain' becomes 'mar'.
'at the top' means one lot of letters go next to another.
'gin' put after 'mar' is 'MARGIN'.
'gets' acts as a link.
(Other definitions for margin that I've seen before include "Blank space around a page" , "Permissible difference" , "Blank space that surrounds the text on a page" , "Edge; room for error" , "Edge, border, fringe" .)