Attachment OK for car when moving (4,4)
I believe the answer is:
roof rack
'attachment ok for car when moving' is the definition.
I know that 'car' relates to this answer.
'ok for car when moving' is the wordplay.
'when moving' is an anagram indicator (I've seen this in other clues).
'ok'+'for'+'car'='okforcar'
'okforcar' is an anagram of 'ROOF RACK'.
Can you help me to learn more?
(Other definitions for roof rack that I've seen before include "Framework for carrying luggage on top of car" , "Carrier for holding luggage on top of a car" , "Framework for carrying things on car roof" , "Frame" , "Framework to carry luggage on top of car" .)