Reward father with coordinate (3)
I believe the answer is:
pay
'reward' is the definition.
(I've seen this in another clue)
'father with coordinate' is the wordplay.
'father' becomes 'pa' (pa can mean dad or father).
'with' means one lot of letters go next to another.
'coordinate' becomes 'y' (as in X and Y coordinates on a grid).
'pa'+'y'='PAY'
(Other definitions for pay that I've seen before include "Give money in exchange for goods or services" , "Be punished" , "Remuneration" , "profitable" , "Financial reward" .)