Father gets half that way (4)
I believe the answer is:
path
'way' is the definition.
(I know that way can be written as path)
'father gets half that' is the wordplay.
'father' becomes 'pa' (pa can mean dad or father).
'gets' is a charade indicator (letters next to each other).
'half' means to take half the letters.
'that' cut in half is 'th'.
'pa'+'th'='PATH'
(Other definitions for path that I've seen before include "Pavement" , "Pedestrian way" , "Line of travel" , "Footway or track" , "Track; direction" .)