Build in the perpendicular style (5)

I believe the answer is:

erect

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

'build' is the definition.
(erecting is a kind of building)

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

(Other definitions for erect that I've seen before include "Construct - perpendicular" , "Rigidly upright" , "Build, upright" , "Upstanding" , "Build, set up" .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.