Screen and pour below street level (6)
I believe the answer is:
strain
'screen' is the definition.
(I know that screen is a more specific form of the action strain)
'pour below street level' is the wordplay.
I cannot quite understand how this works, but
'pour' could be 'rain' (I've seen this in another clue) and 'rain' is present in the answer.
'street' could be 'st' (abbreviation) and 'st' is located in the answer.
No letters remain.
This explanation may well be incorrect...
'and' is the link.
Can you help me to learn more?
(Other definitions for strain that I've seen before include "variety" , "Melody; filter" , "Exert oneself to the utmost" , "Overtired" , "Pass through a filter" .)