Short answer is no, it's not a practical solution because the feet are already designed for gripping in most animals that fly, making clawed hands redundant (just take a look at how eagles and hawks hunt) and most importantly of all, the wings are in point of fact evolved hands that have been reshaped to provide maximum surface area on the wing through ultra long finger bones.
I've put a picture up here that shows the difference between a bat's wing and a bird's wing, but the important thing to note is that both have a 'normal' arm to the point where the wing starts to sweep back, and then the rest of the wing is supported by a strongly modified 'hand' that is better served to the flying creature by providing more surface area to the wing rather than as a grasping appendage.
In the case of birds in particular, they have evolved either beaks, bills or the like that are their primary way of grabbing food, or they have strong claws on their feet used to grab prey while they hunt. This is the offset they use to maximise their flying capacity by literally using a modified hand to almost double their wingspan in many cases.
Your creature is possible, but unlikely because having a clawed hand pretty much halves the span of wing that the creature can use, and perhaps even more importantly, requires the arms to be very muscular in order to use the claws, disrupting the flight model of the creature. Birds and Bats have well developed pectoral muscles (the breast muscle) to power the wing, but the wing itself is very light on with muscles, again to maximise the control surface of the wing, and minimise the mass that the pecs have to deal with. Your creature on the other hand would need strong biceps and triceps, disrupting the control surfaces of the wing and the ability of the bird to control it in real time.
So no, it's not practical and it's far more likely that your bird is going to want to use those hands to increase wingspan and rely on its mouth and feet to grab prey or opponents in flight.