Lash out when you get luck as a prospector (6)

I believe the answer is:

strike

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'lash' is the definition.
(I know that lash is a more specific form of strike)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for strike that I've seen before include "Hit out in industrial dispute" , "mint" , "Song of regret" , "Hit; withdraw labour" , "Sudden success" .)

I've seen this clue in the Evening Standard.

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