Open-top car seen in roll without notice (8)
I believe the answer is:
roadster
'open-top car' is the definition.
(I've seen this before)
'roll without notice' is the wordplay.
'roll' becomes 'roster' ('roster' can be a synonym of 'roll'**).
'without' means one lot of letters goes inside another ('without' can be similar in meaning to 'outside').
'notice' becomes 'ad'.
'roster' going around 'ad' is 'ROADSTER'.
'seen in' is the link.
(Other definitions for roadster that I've seen before include "sporty vehicle" , "Small open-top car" , "Old car" , "Open two-seater car" , "An open car without rear seats" .)