1. British to dump insane but not stupid clots (7)
THROMBI - anagram of british to dump, less the letters of stupid
2. Marvellous! It’s hidden (3,2,5)
OUT OF SIGHT (double definition)
3. An informal, yet intensive, discussion can take place around endless walks (4-2)
TALK-IN - wALKs in TIN ( for CAN)
4. Whips grow weary with each one coming back to earth (8)
FLAGELLA = FLAG + ALL E back
5. Communist Party and Hungary embrace in agreement about an empty tomb (8)
CENOTAPH - I have CP for Communist Party and H for Hungary - with ATONE backwards?