Crossword Genius

Those who take it become aware of goings-on under the surface (6)

Ross

I believe the answer is:

plunge

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'surface' is the definition.
The answer and definition can be both to do with contact as well as being verbs in their base form.
Perhaps they are linked in a way I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for plunge that I've seen before include "land in water" , "Dive quickly" , "Sudden fall" , "Sudden drop" , "Dive or throw into" .)

I've seen this clue in The Irish News.
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