Building a pickup truck (5)
I believe the answer is:
tower
'building' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for tower that I've seen before include "One drawing" , "Stand very high (over)" , "Drawer" , "Steeple" , "Minaret, for example" .)