Crossword Genius

A setter grand, I’m crazy about (7)

Ross

I believe the answer is:

gridman

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

'crazy about' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'a setter grand i'm' is the wordplay.
'grand i'm' can be anagrammed to 'GRIDMAN'.
But, I am not sure how this is indicated.

Can you help me to learn more?

I've seen this clue in The Hindu.
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