Slapdash cut into mole (6)
I believe the answer is:
sloppy
'slapdash' is the definition.
(I know that slapdash can be written as sloppy)
'cut into mole' is the wordplay.
'cut' becomes 'lop' (lopping is a kind of cutting).
'into' means one lot of letters goes inside another.
'mole' becomes 'spy' (I've seen this before).
'lop' inserted into 'spy' is 'SLOPPY'.
(Other definitions for sloppy that I've seen before include "Romantic" , "Excessively casual" , "'Careless, shoddy (6)'" , "Careless; watery" , "Mawkish" .)