Crossword Genius

Domestic tip for a more effective stack (7,3)

Ross

I believe the answer is:

chimney pot

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in The Guardian.
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