Domestic tip for a more effective stack (7,3)
I believe the answer is:
chimney pot
'domestic tip' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'a more effective stack' is the wordplay.
'a more effective' becomes 'chimney' (I can't explain this - if you can you should believe this answer much more).
'stack' becomes 'pot' (synonyms).
'chimney'+'pot'='CHIMNEY-POT'
'for' is the link.
Can you help me to learn more?
(Other definitions for chimney pot that I've seen before include "Highest point on roof?" , "Pitch money (anag) - something on roof" , "smoking pipe" , "Earthenware or metal pipe seen on the roof" , "Fitting visible on roof" .)