Scoffing about rides before quarter past four (8)
I believe the answer is:
derisive
'scoffing' is the definition.
(thesaurus)
'about rides before quarter past four' is the wordplay.
'about' indicates anagramming the letters.
'before' means one lot of letters go next to another.
'quarter' becomes 'e'.
'past' means one lot of letters go next to another.
'four' becomes 'iv' (roman numeral).
'rides' with letters rearranged gives 'deris'.
'e' put after 'iv' is 'ive'.
'deris' next to 'ive' is 'DERISIVE'.
(Other definitions for derisive that I've seen before include "Expressing contempt" , "Contemptuous" , "Taunting" , "'Scornful, mocking (8)'" .)