Detective inspector arresting country's old statesman (8)
I believe the answer is:
disraeli
'old statesman' is the definition.
'disraeli' can be an answer for 'statesman' (I have seen 'Victorian statesman' mean 'disraeli' so perhaps 'statesman' could also mean 'disraeli'). I'm not sure about the 'old' bit.
'detective inspector arresting country's' is the wordplay.
'detective inspector' becomes 'DI'.
'arresting' means one lot of letters goes inside another.
'country' becomes 'Israel' (Israel is an example).
'di' placed around 'israel' is 'DISRAELI'.
Can you help me to learn more?
(Other definitions for disraeli that I've seen before include "Benjamin -, nineteenth century PM" , "Raise lid on this old British prime minister" , "Benjamin ........ 19th century English P.M." , "Benjamin --, former PM" , "Victorian politician" .)