Go back inside with wisdom oozing (7)
I believe the answer is:
seepage
'oozing' is the definition.
(synonyms)
'go back inside with wisdom' is the wordplay.
'go' becomes 'pee' (both can mean to urinate).
'back' shows that the letters should be reversed in order.
'inside' is an insertion indicator.
'with wisdom' becomes 'sage' (I can't justify this - if you can you should believe this answer much more).
'pee' reversed gives 'eep'.
'eep' going into 'sage' is 'SEEPAGE'.
Can you help me to learn more?
(Other definitions for seepage that I've seen before include "Loss from slow leak" , "liquid having soaked through" , "problem with tank" , "Slow leakage" , "Ooze" .)