Hated change, bit upsetting - it's very dangerous (9)
I believe the answer is:
deathtrap
'very dangerous' is the definition.
I can't judge whether this definition defines the answer.
'hated change bit upsetting' is the wordplay.
'change' indicates an anagram.
'bit' becomes 'part' (I've seen this in other clues**).
'upsetting' says the letters should be written in reverse.
'part' in reverse letter order is 'trap'.
'hated' is an anagram of 'death'.
'death'+'trap'='DEATHTRAP'
'it's' is the link.
Can you help me to learn more?
(Other definitions for deathtrap that I've seen before include "Very unsafe structure or vehicle" , "Vehicle which is potentially very dangerous" , "Dangerous building or vehicle - could be lethal" , "A dangerous place, car etc. hated part" , "Extremely unsafe vehicle or building" .)