(pic is not my engine - stole image from interweb - but it is identical arrangement)

Is this the oil breather return or soemthing like that (I am new to these engines)
It looks like this right now - below pic;

I was able to push the pipe further into the mating part which suggest that it might have been loose allowing the oil to 'escape';
It looks like the pipe is held within the mating part by that U-clip type thing - but there is considerable play;
Is this normal ?? Should it be held securely in place? Am I missing a bit?
My google skills failed me in finding a decent diagram (or even the name of the part)??
Cheers for any help.