You once brought inside garden watering pipe — here? (8)
I believe the answer is:
hothouse
'pipe here?' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'you once brought inside garden watering' is the wordplay.
'you once' becomes 'thou' (historical second person pronoun).
'brought inside' means one lot of letters goes inside another.
'garden watering' becomes 'hose' (I can't explain this - if you can you should give a lot more credence to this answer).
'thou' inserted within 'hose' is 'HOTHOUSE'.
Can you help me to learn more?
(Other definitions for hothouse that I've seen before include "Environment encouraging rapid growth" , "Warm environment for plants" , "pressurised environment" , "part of garden" , "Environment aiding rapid growth or development" .)