Bumper vehicle to avoid initial masses (6)
I believe the answer is:
dodgem
'bumper vehicle' is the definition.
'Dodgem' can be an answer for 'vehicle' (Dodgem is an example). I am not sure about the 'bumper' bit.
'avoid initial masses' is the wordplay.
'avoid' becomes 'dodge' (dodging is a kind of avoiding).
'initial' says to take the initial letters.
The initial letter of 'masses' is 'm'.
'dodge'+'m'='DODGEM'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for dodgem that I've seen before include "Fairground amusement vehicle" , "ride - with 14a" , "Electric car" , "Bumper car" , "Small car at funfair for bumping into others" .)