Support police seizing vessel where prices are falling (4,6)

I believe the answer is:

fire escape

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'support' is the definition.
(I know this)

I can't explain the rest of the clue.

(Other definitions for fire escape that I've seen before include "it could be a life-saver" , "Emergency flight perhaps" , "Emergency exit" , "Emergency way out" , "Evacuation staircase" .)

I've seen this clue in The Daily Mail.

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