Wife stops digging asunder (2,3)
I believe the answer is:
in two
'asunder' is the definition.
(I've seen this before)
'wife stops digging' is the wordplay.
'wife' becomes 'w' (abbreviation).
'stops' is an insertion indicator (stopping can mean blocking a gap).
'digging' becomes 'into' (to dig something is to appreciate it or be into it).
'w' going within 'into' is 'IN TWO'.
(Other definitions for in two that I've seen before include "Asunder" , "Completely divided" , "divided up thus?" , "simply split" , "apart" .)