Having much responsibility, like a driver with warm bottom? (2,3,3,4)
I believe the answer is:
in the hot seat
'having much responsibility like a driver' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'warm bottom?' is the wordplay.
I cannot really see how this works, but
'warm' could be 'hot' (associated in meaning) and 'hot' is present in the answer.
'bottom?' could be 'sea' (sea bottom is a kind of bottom) and 'sea' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'with' is the link.
Can you help me to learn more?
(Other definitions for in the hot seat that I've seen before include "Placed where difficult situations are faced" , "Uncomfortable position" , "Carrying a big responsibility" , "with capital punishment imminent?" .)