Crossword Genius

My one is a pit (4)

Ross

I believe the answer is:

mine

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

'my' is the definition.
(I know that mine can be written as my)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for mine that I've seen before include "I made?" , "Store" , "Coalpit" , "Excavate for minerals" , "Pit; belonging to me" .)

I've seen this clue in The Mirror.
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