A youngster, still growing wing primaries? If so, yes it's likely to be angel wing. You tape the wing up - depends on the severity. If taping the end sticking out bit to the main wing does the trick, that's fine, but if that stilk flops sometimes you have to tape the whole wing to the body. You must re-do the tape every few days to allow for growth. So the trick is finding something that's waterproof, sticky enough to last for 4 days but that you can then take off! I find the 'stick to itself' crepe bandage the best - the vets have it but so do Boots.
I had a gosling with really bad angel wings as a youngster but did the above and you'd never know now - she's handsome and flying