With help from the palace, call for fortification (8)

I believe the answer is:

palisade

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'for fortification' is the definition.
(palisade is a kind of fortification)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for palisade that I've seen before include "paling" , "Fence of stakes or iron railings" , "Fortification" , "Stockade" , "defence work" .)

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

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