Hint of marijuana in Hoskins's nether regions makes for nasty surprise (9)
I believe the answer is:
bombshell
'nasty surprise' is the definition.
'bombshell' can be an answer for 'surprise' (bombshell is a kind of surprise). I'm not sure about the 'nasty' bit.
'hint of marijuana in hoskins's nether regions' is the wordplay.
'hint of' says to take the initial letters (the smallest possible amount of the word).
'in' indicates putting letters inside.
'hoskins' becomes 'bobs' (I can't explain this - if you can you should believe this answer much more).
'nether regions' becomes 'he'll' (I've seen this in another clue).
The initial letter of 'marijuana' is 'm'.
'm' placed within 'bobs' is 'bombs'.
'bombs'+'hell'='BOMBSHELL'
'makes for' is the link.
Can you help me to learn more?
(Other definitions for bombshell that I've seen before include "That really is surprising" , "Sudden disappointment" , "Big surprise" , "Sudden and surprising piece of news" , "attractive blonde" .)