Related Clues:
- Is tight-lipped
- Stops yapping
- Shuts up
- Stops talking suddenly
- Goes mum
- Is mum making chowder with nothing missing?
- Refuses to talk about sea-food drink
- Stops talking about bashes at Oxford?
- Goes mum, and hint to what 3-, 9-, 10-, and 14-Down literally have in common
- Figuratively, stops talking ... or, literally, what are hidden in this puzzle's four longest answers
- Is mum's seafood chowder out of the ordinary?
- Zips one's lip
- Goes quiet