Appropriate vehicle parts hired again? (8)
I believe the answer is:
relevant
'appropriate' is the definition.
(I've seen this before)
'vehicle parts hired again' is the wordplay.
'vehicle' becomes 'van' (type of vehicle).
'parts' means one lot of letters goes inside another (in the sense of cuts or separates).
'hired again' becomes 'relet' (to re-let something can mean to hire it again).
'van' placed inside 'relet' is 'RELEVANT'.
(Other definitions for relevant that I've seen before include "Germane or pertinent" , "Bearing upon the matter in hand" , "Suitable" , "To the point" , "Bearing on the issue in hand" .)