John Kettley's focus on a hydrocarbon veto uncovered (6)
I believe the answer is:
toilet
'john' is the definition.
(I know that toilet is a type of john)
'kettley's focus on a hydrocarbon veto uncovered' is the wordplay.
'focus' says to take the centre (focus can mean the centre of something).
'on' indicates putting letters inside (as in clothing 'on' a person).
'a hydrocarbon' becomes 'oi' (I can't explain this - if you can you should give a lot more credence to this answer).
'uncovered' means to look at the middle letters.
The centre of 'kettleys' is 'tl'.
The middle of 'veto' is 'et'.
'tl' going around 'oi' is 'toil'.
'toil'+'et'='TOILET'
Can you help me to learn more?
(Other definitions for toilet that I've seen before include "A formal loo" , "Plumbing fixture" , "something to go on?" , "Lavatory paper" , "Smallest room" .)