Crossword Genius

Building a pickup van (5)

Ross

I believe the answer is:

tower

I'm a little stuck... Click here to teach me more about this clue!

'building' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for tower that I've seen before include "One to pull" , "Campanile, spire etc" , "famous prison" , "See 4 Down" , "Turret" .)

I've seen this clue in The Daily Express.
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