Regarding shift being cut (6)
I believe the answer is:
remove
'being cut' is the definition.
(thesaurus)
'regarding shift' is the wordplay.
'regarding' becomes 're' ('re' means regarding or about).
'shift' becomes 'move' (I've seen this before).
're'+'move'='REMOVE'
(Other definitions for remove that I've seen before include "Take something away" , "Take away, dispose of" , "Bunter's form" , "Takeaway" , "Subtract" .)