Bad end to poorest spring for local canvass (8)
I believe the answer is:
doorstep
'canvass' is the definition.
'bad end to poorest spring for local' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'poorest' is 'oorstep' which is within the answer.
A single letter 'd' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for doorstep that I've seen before include "Sill at threshold" , "Torpedos (anag.)" , "substantial amount of bread" , "chunk of bread" , "sliced bread" .)