Street leading to the old eyesore? (4)
I believe the answer is:
stye
'eyesore?' is the definition.
(I've seen this before)
'street leading to the old' is the wordplay.
'street' becomes 'st' (abbreviation).
'leading to' is a charade indicator (letters next to each other) (some letters go before or lead others).
'the old' becomes 'ye' (resembles a historical spelling of 'the').
'st'+'ye'='STYE'
(Other definitions for stye that I've seen before include "Observer's problem" , "Eye sore" , "Ocular affliction" , "irritation to the viewer" , "dump" .)