Make tracks over sludge (3)
I believe the answer is:
goo
'sludge' is the definition.
(synonyms)
'make tracks over' is the wordplay.
'make tracks' becomes 'go' (I can't explain this - if you can you should believe this answer much more).
'over' becomes 'o' (cricket abbreviation).
'go'+'o'='GOO'
Can you help me to learn more?
(Other definitions for goo that I've seen before include "Sticky or slimy substance" , "Viscous matter" , "Sentimentality (sl.)" , "Sticky gunge" , "syrup" .)
