Silly bendy bus entering a road (6)
I believe the answer is:
absurd
'silly' is the definition.
(I've seen this in another clue)
'bendy bus entering a road' is the wordplay.
'bendy' is an anagram indicator (the word is bent out of shape).
'entering' is an insertion indicator.
'road' becomes 'rd' (abbreviation for road).
'bus' with letters rearranged gives 'bsu'.
'a'+'rd'='ard'
'bsu' inserted within 'ard' is 'ABSURD'.
(Other definitions for absurd that I've seen before include "Derisory, preposterous" , "word to describe Beckett's theatre!" , "Quite ridiculous, silly" , "'Derisory, cockeyed (6)'" , "10 18's [SAMUAL BECKETT] style of theatre" .)