I sell out of this thread (5)
I believe the answer is:
lisle
'this thread' is the definition.
(lisle is a kind of thread)
'i sell out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'i'+'sell'='isell'
'isell' anagrammed gives 'LISLE'.
'of' acts as a link.
(Other definitions for lisle that I've seen before include "Type of cotton yarn" , "Strong cotton fabric" , "Cotton stocking thread" , "Pedestrianised city" , "Fine smooth cotton thread for stockings" .)