Hmm - the below is the parts diagram for the equivalent TM model (which I presume the Cyma is largely/entirely based upon). It's rather difficult to fathom out - is it part M14-2 ? But - I’ve just had a look at my (assembled) CM032 - that whole part you circle is made of metal. From your original photo, it looks like the part that has snapped is plastic? If so, it is simply the feed tube that is part of the hop unit passing through a hole in that plate. It's a while since I had mine apart so i can't say for certain, but if you are able to ascertain the snapped part on yours is plastic, that’s a good clue that it is the hop unit that needs replacing only.
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