Leaks and passes water over a long time (8)
I believe the answer is:
seepages
'leaks' is the definition.
(I've seen this before)
'passes water over a long time' is the wordplay.
'passes water' becomes 'pees' ('pee' can be a synonym of 'pass water').
'over' shows that the letters should be reversed in order.
'a long time' becomes 'ages' (ages can mean a very long time).
'pees' written backwards gives 'seep'.
'seep'+'ages'='SEEPAGES'
'and' is the link.
(Other definitions for seepages that I've seen before include "Escapes" , "Leaks" .)