Single woman to turn rest out (8)
I believe the answer is:
spinster
'single woman' is the definition.
(I've seen this before)
'turn rest out' is the wordplay.
'turn' becomes 'spin' (spin is a kind of turn).
'out' indicates an anagram (out can mean wrong or inaccurate).
'rest' anagrammed gives 'ster'.
'spin'+'ster'='SPINSTER'
'to' acts as a link.
(Other definitions for spinster that I've seen before include "For example, Miss Havisham" , "She never married" , "One spurning union activity" , "matchless female" , "Unmarried older woman" .)