Spend lots to make a pool entry (6)

I believe the answer is:

splash

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'entry' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps you can see an association between them that I don't see?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for splash that I've seen before include "Slop (liquid) over" , "big front page news" , "Make liquid fly around" , "Fall in irregular drops" , "Spattering of liquid from sudden disturbance" .)

I've seen this clue in the Sydney Morning Herald.

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