Like the solvers, the setters are back to square one (2,3,4)
I believe the answer is:
as you were
'back to square one' is the definition.
(I've seen this before)
'like the solvers the setters are' is the wordplay.
'like' becomes 'as'.
'the solvers' becomes 'you' (the person or people solving the crossword).
'the setters are' becomes 'we're' (we are - referring to crossword setters).
'as'+'you'+'were'='AS YOU WERE'
(Other definitions for as you were that I've seen before include "back to square one" , "Military command - return to former position" , "Military command to return to previous position" , "Return to your previous position - that's an order" , "order for military" .)