Crossword Genius

Prospective wealth he has left to marine? It’s a shocking event (8,5)

Ross

I believe the answer is:

electric storm

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'prospective wealth' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'he has left to marine? it's a shocking event' is the wordplay.
I cannot quite see how this works, but
'he' could be 'ric' and 'ric' is found within the answer.
'left' could be 'l' (common abbreviation) and 'l' is present in the answer.
'to' is found in the answer.
'marine?' could be 'rm' (abbreviation for Royal Marine) and 'rm' is present in the answer.
'it's' could be 'ts' (abbreviation. e.g. in 'tis) and 'ts' is found within the remaining letters.
The remaining letters 'eec' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for electric storm that I've seen before include "Violent atmospheric disturbance" , "creates a great disturbance" , "A highly charged disturbance?" .)

I've seen this clue in The Times.
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