Spit in drain around end of track (6)
I believe the answer is:
skewer
'spit' is the definition.
(synonyms)
'drain around end of track' is the wordplay.
'drain' becomes 'sewer' (sewer is a kind of drain).
'around' means one lot of letters goes inside another.
'end of' indicates one should take the final letters.
The final letter of 'track' is 'k'.
'sewer' placed around 'k' is 'SKEWER'.
'in' is the link.
(Other definitions for skewer that I've seen before include "Meat-pin" , "Wooden or metal mat pin" , "Pin holding the roast together" , "Kebab-securer" , "Meat-securing pin" .)