Loud clicking noise coming from front left axle?

The other day I was fishtailing my Honda Foreman TRX400FW '95 in gravel when I noticed a load clicking noise coming from the front left side. I have looked around that area and have taken of the wheel and found it is not the wheel, but is coming from the axle - UV joint. ( at least thats what I think the part is, I'm not all that knowledgeable.)

It is 'my' quad, but I would prefer not to tell my grandfather something is wrong with it unless there actually is. So basically I am wondering if it is possible for a rock to be in there, and if so how to go about extracting it? It almost sounds as if its metal clanking though, and it is repeated clicking that gets worse when turning while giving it gas, although after getting up speed I can coast and turn while coasting with no unusual sounds.

Any and all help is greatly welcomed, and I apologize for my first post here being about help. I hope to get my ATV fixed and to join in on some other discussions!

P.S. Any pricing for a part it could be or any other suggestions of what it can be are welcomed.

P.S.S. If any more details are needed/wanted I would happily provide them!