Well nigh a cul-de-sac? (5)
I believe the answer is:
close
This clue might be a double definition.
'well nigh' is the first definition.
'close' can be an answer for 'nigh' (similar in meaning). I'm unsure of the 'well' bit.
'a cul-de-sac?' is the second definition.
(I know that cul-de-sac can be written as close)
Can you help me to learn more?
(Other definitions for close that I've seen before include "on very affectionate terms" , "seal" , "block, > unventilated" , "Bar" , "Shut - sultry" .)