One and minus one, continuously (2,3)
I believe the answer is:
on end
'continuously' is the definition.
(thesaurus)
'one and minus one' is the wordplay.
'minus' is a deletion indicator.
'one' becomes 'a'.
'and' with 'a' removed is 'nd'.
'one'+'nd'='ON END'
(Other definitions for on end that I've seen before include "Erect; at a stretch" , "Continuing without stopping; upright" , "continuing in an upright position" , "Upright, without cease" , "Without pause" .)