Victorian PM in lair dies horribly (8)
I believe the answer is:
disraeli
'victorian pm' is the definition.
(I've seen this before)
'lair dies horribly' is the wordplay.
'horribly' is an anagram indicator.
'lair'+'dies'='lairdies'
'lairdies' with letters rearranged gives 'DISRAELI'.
'in' acts as a link.
(Other definitions for disraeli that I've seen before include "Old Prime Minister and novelist" , "C19 Prime Minister" , "PM, bought Suez Canal" , "Queen Victoria's favourite prime minister, d. 1881" , "Benjamin ........ 19th century English P.M." .)