Across
Characteristic of radioactive decay found in lithium and iron (4-4)
Have a go at wife leaving festive occasion (6)
Water to some extent absorbs toxic compound (8)
Inane urban type lacking in consideration (6)
Understand the difference record margin had in cuts (12)
Where Roman contests were seen some time back (5)
Celebrity to change course half-heartedly and begin again (5,4)
Ruin dreadful couple's adopted son (9)
Ancient ship on lake moving slowly (5)
In favour of member warning about introduction (12)
Complete part of joint activity (6)
Line, say, reflected poem as written (8)
Bloke on the radio that vents periodically (6)
Most strict testers finish off examination with a twist (8)
Down
Expect much fancied favourite to lose every time (4)
My choice of central elements in building (4)
Pay off overdue £1 charges (9)
Study following nomadic Africans engages British polymath (7,5)
Part of Egypt in Asia not entirely developed (5)
Criticise an author's publicity material (10)
Ideal ground secures backing for facilities (6,4)
Staff in broadcast said to welcome argument (12)
Revolutionary movement transfers power round (10)
Each point somebody thought fit to publicise? (10)
Remarkable stable state that is difficult to achieve (4,5)
Host seems clever eliminating every other part (5)
Key passage in recital (4)
The buck stops here! (4)
Type letters or click words in the clue