Road surface making snake stop (7)
I believe the answer is:
asphalt
'road surface' is the definition.
(I've seen this in another clue)
'snake stop' is the wordplay.
'snake' becomes 'asp' (asp is a kind of snake).
'stop' becomes 'halt' (halt can mean to stop).
'asp'+'halt'='ASPHALT'
'making' is the link.
(Other definitions for asphalt that I've seen before include "Paving material" , "Mixture of tar and gravel for paving" , "Road-surfacing material" , "Bituminous substance used for roofs and roads" , "Roofers use this" .)