Crossword Genius

Well nigh a cul-de-sac? (5)

Ross

I believe the answer is:

close

I'm a little stuck... Click here to teach me more about this clue!

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" .)

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