Crossword Genius

Crazy place for flags? (2,3,4)

Ross

I believe the answer is:

up the pole

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for up the pole that I've seen before include "Maybe trying to repair telephone line" , "Where ensign may be" , "Stars and stripes may be" , "23 [NUTTY]" , "Wacky" .)

I've seen this clue in the Sydney Morning Herald.
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