Surpass when it comes to making money from assets? (8)

I believe the answer is:

outstrip

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'surpass' is the definition.
('outstrip' can be a synonym of 'surpass')

I can't explain the remainder of the clue.

(Other definitions for outstrip that I've seen before include "Go far ahead of" , "Surpass, do better than" , "Surpass, overtake" , "Exceed in performance" , "As to purist, surpass or run faster" .)

I've seen this clue in the Evening Standard.

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