The beginning or the end of Welsh rugby? (9)

I believe the answer is:

semivowel

I'm a little stuck... Click here to teach me more about this clue!

'welsh rugby?' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.