Extend drapes out (6)
I believe the answer is:
spread
'extend' is the definition.
(I know that spread is a more specific form of the action extend)
'drapes out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'drapes' with letters rearranged gives 'SPREAD'.
(Other definitions for spread that I've seen before include "Type of betting" , "expansion?" , "extended" , "Special display" , "Soft paste; large meal" .)