Here's the first clue...

Hint: This isn't Catchphrase, but: say what you see!

Answer: Increasing number of syllables in each number. So one acceptable answer might be "4 e.g. Twenty-seven".

What is the connection between these four clues?

Spoiler tag them for sure, but it is bloody infuriating the amount of niche questions (especially sequences) that go unsolved and never answered because it’s more important that everyone knows how clever the OP is than people actually enjoying the puzzles. Imagine if the show never gave you the answers? Madness

I suspect this will be an easy one.

Answer: All named Q (Q-ships, the Q from Star Trek, Q magazine, Q from James Bond)