Crossword Genius

It has an opening for gambling (4,7)

Ross

I believe the answer is:

slot machine

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

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

'it has an opening' is the wordplay.
'it' becomes 'machine' (I can't explain this - if you can you should believe this answer much more).
'has' is a charade indicator (letters next to each other).
'an opening' becomes 'slot' (slot is a kind of opening).
'machine' after 'slot' is 'SLOT-MACHINE'.

'for' is the link.

Can you help me to learn more?

(Other definitions for slot machine that I've seen before include "One-armed bandit" , "Coin-fed device" , "2 8 [CASINO GAME]" .)

I've seen this clue in The Mirror.
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