Twine regularly used to do this (3)
I believe the answer is:
tie
'to do this' is the definition.
The definition suggests a singular noun which matches the answer.
'twine regularly' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternating letters of 'twine' are 'TIE'.
'used' is the link.
(Other definitions for tie that I've seen before include "oblige" , "Get even" , "Restrict; fasten" , "Bind; dead heat" , "No-win situation" .)