Beastly fare-dodgers, say, hiding in vehicles? (6)
I believe the answer is:
vegans
'beastly fare-dodgers' is the definition.
I can't tell whether this definition defines the answer.
'say hiding in vehicles?' is the wordplay.
'say' becomes 'eg' (both can mean for example).
'hiding in' is an insertion indicator.
'vehicles?' becomes 'vans' (van is a kind of vehicle).
'eg' put inside 'vans' is 'VEGANS'.
Can you help me to learn more?
(Other definitions for vegans that I've seen before include "Extreme vegetarians" , "People who don't want certain food" , "Very strict vegetarians" , "They eat no animal products" .)