Vehicle required for advancement? (3)
I believe the answer is:
van
'vehicle' is the definition.
(van is a kind of vehicle)
'required for advancement?' is the wordplay.
'required for' indicates a hidden word.
'VAN' can be found hidden inside 'advancement'.
(Other definitions for van that I've seen before include "Light vehicle" , "Goods vehicle" , "Commercial vehicle at head of army" , "Trade vehicle" , "trailer" .)