Cook rice as directed on package. Set aside to cool.
Meanwhile, shred carrots into a large bowl. Dice cucumber and celery; chop onion, apple and parsley; thinly slice radishes; and drain and rinse chickpeas. Add to bowl with carrots, along with walnuts and cranberries.
In a separate small bowl (or mason jar with lid), add grapeseed oil, lemon juice, honey, white wine vinegar, mustard, salt, and pepper; mix well. Pour into bowl of veggies and add cooked rice. Toss together to coat evenly.
Serve immediately at room temperature, or refrigerate for later and serve chilled.