Crossword Genius

This thing is boiling, you understand (3)

Ross

I believe the answer is:

see

I'm a little stuck... Click here to teach me more about this clue!

'understand' is the definition.
(I know that see is a kind of the understand)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for see that I've seen before include "Go out with; notice" , "make out" , "around cathedral" , "Observe - diocese" , "Bishops office" .)

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