Avoid monstrous case involving carelessly driven vehicles (7)
I believe the answer is:
dodgems
'carelessly driven vehicles' is the definition.
'Dodgems' can be an answer for 'vehicles' (Dodgem is an example). I am unsure of the 'carelessly driven' bit.
'avoid monstrous case' is the wordplay.
'avoid' becomes 'dodge' (dodge can mean to avoid or evade).
'case' suggests removing the centre.
'monstrous' with its centre taken out is 'ms'.
'dodge'+'ms'='DODGEMS'
'involving' acts as a link.
Can you help me to learn more?
(Other definitions for dodgems that I've seen before include "Fairground cars" , "fair source of revenue" , "Fairground attraction" , "fair features" .)