Daughter splits and moves off course (6)
I believe the answer is:
drifts
'moves off course' is the definition.
'daughter splits' is the wordplay.
'daughter' becomes 'd'.
'splits' becomes 'rifts' (I've seen this before**).
'd'+'rifts'='DRIFTS'
'and' is the link.
(Other definitions for drifts that I've seen before include "proceeds without purpose" , "Floats along aimlessly" , "Wanders around" , "mine passages" , "Heaps of snow blown by the wind" .)