Stray daughter on crack (5)
I believe the answer is:
drift
'stray' is the definition.
('drift' can be a synonym of 'stray')
'daughter on crack' is the wordplay.
'daughter' becomes 'd'.
'on' means one lot of letters go next to another.
'crack' becomes 'rift' (rift is a kind of crack**).
'd'+'rift'='DRIFT'
(Other definitions for drift that I've seen before include "Large heap (of snow)" , "Gist - snow" , "Move casually or aimlessly" , "non-standard deviation?" , "go with the tide" .)