Deed empowering a third-party to mediate in a financial transaction (6)

I believe the answer is:

escrow

(Other definitions for escrow that I've seen before include "Conditional deed held by third party" , "Deed or deposit held until a condition is fulfilled" , "fund held in trust?" , "back-up security" , "Legal deed to take effect when a condition is fulfilled" .)

I've seen this clue in The Times.

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