About 50 falsely accused in blind alley (3,2,3)
I believe the answer is:
cul de sac
'blind alley' is the definition.
(I've seen this before)
'about 50 falsely accused' is the wordplay.
'about' indicates putting letters inside.
'50' becomes 'l' (Roman numeral).
'falsely' indicates an anagram.
'accused' with letters rearranged gives 'cudesac'.
'l' put within 'cudesac' is 'CUL-DE-SAC'.
'in' is the link.
(Other definitions for cul de sac that I've seen before include "Blind alley" , "Dead end street" , "Dead-end road" , "Block end; no through road" .)